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WorksheetsIntroduction to Cell Types 1
Total questions: 150
Worksheet time: 1hrs 15mins
Which statement best distinguishes eukaryotic cells from prokaryotic cells?
Eukaryotic cells lack a nucleus; prokaryotic cells have one
Eukaryotic cells have a nucleus and membrane-delimited organelles; prokaryotic cells lack both
Prokaryotic cells contain many membrane-delimited organelles; eukaryotic cells do not
Both eukaryotic and prokaryotic cells have nuclei but differ in size
Which of the following groups are classified as eukaryotic organisms?
Bacteria and archaea
Plants, fungi, animals, and protists
Viruses only
Bacteria, plants, and animals
Prokaryotic cells belong to which domains of life according to the material?
Plants and fungi
Animals and protists
Bacteria and archaea
Protists and animals
In the provided image caption, Paramecium aurelia is identified as a protist. Based on the material, which cellular classification does this imply?
Prokaryote
Virus
Eukaryote
Bacterium
Which feature is present in eukaryotic cells but absent in prokaryotic cells, as emphasized in the section?
Cell membrane
Ribosomes
Nucleus and membrane-delimited organelles
Cytoplasm
Most protists are described as which of the following?
Multicellular organisms
Unicellular organisms
Prokaryotic bacteria
Archaea
The course BIOL 100 will focus on which major cell type?
Prokaryotic cells
Eukaryotic cells
Only bacterial cells
Only archaeal cells
Which development in the 1600s was fundamental to revealing the importance of cells in biology?
The invention of DNA sequencing
Work with early light microscopes
Discovery of antibiotics
The first electron microscope
Who produced an early drawing of plant tissue compartments called “cellulae” and published it in Micrographia (1665)?
Anton van Leeuwenhoek
Matthias Schleiden
Robert Hooke
Rudolf Virchow
What key advantage did new types of microscopes, such as the electron microscope (starting in the 1950s), provide to biologists?
Ability to culture cells faster
More detailed views of cells
Direct measurement of DNA sequences
Observation of only living cells
Which statement best describes how the three tenets of Cell Theory were developed by ~1849?
They were deduced from a single experiment.
They arose from inductive reasoning based on many scientists’ observations.
They were proposed to support spontaneous generation.
They were derived from mathematical proofs.
Which of the following is NOT one of the three generalizations of Cell Theory?
All organisms are composed of one or more cells.
The cell is the basic living unit of organization.
All cells arise from pre-existing cells.
Organisms can arise from non-living sources.
Spontaneous generation proposed that organisms could arise from non-living sources. Which example was historically cited to support this idea?
Bacteria dividing to form two cells
Maggots appearing from rotting flesh
Seeds germinating in soil
Baby clams developing from parent clams
Which statement correctly contrasts Cell Theory with spontaneous generation?
Cell Theory states that cells can form from sunlight and water, whereas spontaneous generation denies this.
Cell Theory asserts that all cells arise from pre-existing cells, whereas spontaneous generation claimed organisms could originate from non-living matter.
Cell Theory focuses on multicellular organisms only, whereas spontaneous generation concerns unicellular organisms.
Cell Theory applies only to plants, whereas spontaneous generation applies to animals.
A biologist in the 1950s wants to observe intracellular structures at very high resolution. Based on the historical timeline, which instrument should they use?
Early light microscope
Electron microscope
Hand lens
Compound light microscope from the 1600s
Which sequence best reflects the progression described: initial observations, improved instrumentation, and broader biological understanding?
Electron microscopes reveal cells; light microscopes later confirm; Hooke names cellulae.
Early light microscopes show compartments; new microscopes like electron microscopes provide more detail; the universal importance of cells becomes appreciated.
Spontaneous generation is proven; Hooke disputes it; electron microscopes are abandoned.
Cell Theory is proposed first; Hooke draws cells; light microscopes are invented to test it.
Which statement is one of the recent generalities about cells?
Only eukaryotic cells contain DNA.
All cells are surrounded by a plasma membrane.
Only prokaryotic cells have a membrane.
Cells do not require DNA for basic functions.
According to the material, what are the two fundamentally different types of cells?
Animal and plant
Bacteria and viruses
Eukaryotic and prokaryotic
Protists and fungi
What is identified as the fundamental unit of biological organization capable of performing all activities of life?
Organs
Tissues
Cells
Molecules
Which claim about culturing is supported by the material?
Viruses are readily cultured independently of cells.
It is possible to culture animal or plant cells from multicellular organisms.
Only bacteria can be cultured, not eukaryotic cells.
Anything smaller than a cell can be cultured with modern techniques.
In the Three Domain System, which two groups are prokaryotes?
Bacteria and Eukarya
Archaea and Eukarya
Bacteria and Archaea
Protists and fungi
All eukaryotic cells belong to which domain?
Bacteria
Archaea
Eukarya
Protista
Which feature characterizes eukaryotic cells as described?
Lack of a nucleus and absence of compartments
Presence of a nucleus and compartmentalization with specialized parts
Single circular chromosome in the cytoplasm
No specialization of cellular regions
Which set lists only groups included within the Domain Eukarya?
Plants, protists, fungi, animals
Bacteria, archaea, fungi, plants
Archaea, protists, animals, bacteria
Bacteria, fungi, animals, viruses
What does the evolutionary sketch imply about the earliest eukaryotes?
They were animals.
They were fungi.
They were protists.
They were plants.
Which images illustrate bacteria as examples of prokaryotic cells?
A. Salmonella typhimurium and B. Escherichia coli (E. coli)
C. Pyrolobus sp. and D. hot spring microbial mat
A. Vorticella campanula colony and B. fly agaric
C. field elm leaves and D. 13-lined ground squirrel
According to the prokaryote examples, which domain is often found in “extreme” environments?
Bacteria
Archaea
Protists
Fungi
The hot spring microbial mat pictured is most closely associated with which group?
Bacteria
Archaea
Protists
Animals
Which statement best distinguishes prokaryotic from eukaryotic examples shown across the two pages?
Prokaryotic examples include multicellular organisms like plants and animals, while eukaryotic examples are all microbes.
Prokaryotic examples (bacteria and archaea) are microbes, whereas many eukaryotic examples (fungi, plants, animals) are multicellular.
Both prokaryotic and eukaryotic examples are exclusively unicellular.
Only eukaryotic organisms can live in extreme environments.
On the eukaryote page, which organism is identified as a protist?
Fly agaric (Amanita muscaria)
Leaves of the field elm (Ulmus minor)
13-lined ground squirrel (Spermophilus tridecemlineatus)
A colony of Vorticella campanula
Which pairing correctly matches an organism to its broader eukaryotic group as illustrated?
Amanita muscaria → plant
Ulmus minor → fungus
Spermophilus tridecemlineatus → animal
Vorticella campanula → bacterium
A researcher isolates a microbe from a hot spring that resembles Pyrolobus sp. Based on the examples, which cellular category should they first consider?
Eukaryote: protist
Prokaryote: archaeon
Eukaryote: fungus
Prokaryote: bacterium
Most protists are described how, according to the eukaryote examples?
As multicellular organisms
As microbes
As animals
As plants
Which statement correctly distinguishes eukaryotic cells from prokaryotic cells?
Eukaryotic cells lack DNA while prokaryotic cells contain DNA.
Eukaryotic cells have a nucleus; prokaryotic cells do not.
Prokaryotic cells possess membrane-delimited organelles; eukaryotic cells do not.
Both eukaryotic and prokaryotic cells have nuclei.
The term eukaryote derives from Greek meaning which of the following?
before kernel/nut
true bacteria
good kernel/nut
membrane-bound
Which cellular feature is present in eukaryotes but absent in prokaryotes according to the material?
Nucleoid region
Ribosomes
Membrane-delimited organelles (e.g., mitochondria, ER)
Cell wall
About when did eukaryotic cells first appear, based on the evolutionary timeline provided?
~3.5 BYA
~2.7 BYA
~1.8 BYA
~0.5 BYA
Which statement best describes prokaryotic cells relative to eukaryotic cells in terms of evolutionary age?
Prokaryotic cells are much more ancient than eukaryotic cells.
Prokaryotic cells evolved after eukaryotic cells.
Both appeared at the same time in Earth’s history.
Prokaryotic cells appeared ~1.8 BYA.
In the generalized bacterium diagram, which labeled region contains the DNA in a prokaryotic cell?
Nucleus
Nucleoid region
Golgi apparatus
Mitochondrion
Which structure used for motility is depicted extending from the bacterium in the prokaryotic cell diagram?
Cilium
Pseudopod
Flagellum
Pilus (single pilus)
Which claim about cell size is supported by the provided material?
Prokaryotic cells are generally larger than eukaryotic cells.
Eukaryotic cells are generally larger than prokaryotic cells.
Both cell types are the same size on average.
Cell size cannot be compared between the groups.
According to the eukaryote cell diagram, which component encloses the nucleus and contains pores that allow material to move in and out?
Plasma membrane
Nucleolus
Nuclear envelope
Chromatin
Which statement correctly contrasts internal organization between eukaryotes and prokaryotes?
Eukaryotes have lots of internal membranes forming specialized spaces; prokaryotes do not.
Both eukaryotes and prokaryotes contain mitochondria.
Prokaryotes have more membrane-bound organelles than eukaryotes.
Prokaryotes contain a nucleus whereas eukaryotes do not.
Which organelle is identified as producing energy in the eukaryotic cell diagram?
Golgi apparatus
Lysosome
Mitochondria
Peroxisome
Which structure is described as the microtubule-organizing center in the eukaryotic cell diagram?
Centrosome
Cytoskeleton
Intermediate filaments
Microfilaments
Which cytoskeletal element helps form the mitotic spindle and maintain cell shape?
Microtubules
Intermediate filaments
Microfilaments
Actin cortex only
Which eukaryotic organelle modifies proteins, according to the labeled diagram?
Golgi apparatus
Lysosome
Peroxisome
Nucleolus
Which pairing of structure and function is correctly matched as shown in the diagram?
Lysosome—produces ATP
Peroxisome—metabolizes waste
Nucleolus—houses DNA genome
Smooth endoplasmic reticulum—makes secretory and membrane proteins
Which statement about the endoplasmic reticulum is supported by the diagram?
Rough ER is associated with ribosomes and makes secretory and membrane proteins; Smooth ER makes lipids.
Smooth ER is associated with ribosomes and makes proteins; Rough ER makes lipids.
Both Rough and Smooth ER make DNA.
ER is absent from eukaryotic cells.
Which statement best reflects Definition #1 of an organelle provided in the material?
Any subcellular structure, with or without a membrane
Membrane-delimited subcellular compartments
Any protein complex within a cell
Any structure larger than a ribosome
According to Definition #2 of organelle, which of the following would be considered an organelle?
Only membrane-bound structures
Only the nucleus and mitochondria
Any subcellular structure, even without a membrane
Only structures found in eukaryotes
Ribosomes are described as protein-building machines that do not have a membrane. Based on the two definitions given, how are ribosomes classified?
Organelles by both definitions
Not organelles by either definition
Organelles by Definition #1 only
Organelles by Definition #2 only
Which statement about eukaryotes and prokaryotes aligns with the summary provided?
Both eukaryotes and prokaryotes have membrane-delimited subcellular compartments
Eukaryotes have membrane-delimited subcellular compartments, whereas prokaryotes do not
Prokaryotes have a nucleus but eukaryotes do not
Neither eukaryotes nor prokaryotes have ribosomes
Under Definition #1 of organelle, how would prokaryotes be characterized regarding organelles?
They have organelles because they have ribosomes
They do not have organelles because they lack membrane-delimited compartments
They have only one organelle: the nucleoid
They have organelles only during cell division
The material notes that some people use the terms vacuole and vesicle interchangeably. Which statement best defines a vesicle as used here?
Any large water-filled compartment regardless of membrane composition
Any small organelle composed of a phospholipid bilayer that encloses a fluid-filled volume
Any protein complex involved in transport
A membrane-free storage site for lipids
Endosomes and phagosomes are mentioned in relation to vesicles. How are they categorized in the material?
They are examples included within the broader category of vesicles
They are distinct from vesicles and never considered vesicles
They refer exclusively to plant vacuoles
They are ribosomal subunits
Refer to the diagram of a generic vesicle. Which arrangement is correctly described?
Hydrophilic heads face the interior aqueous solution and hydrophobic tails face the exterior
Hydrophobic tails face the aqueous solution while hydrophilic heads point inward only
Hydrophilic heads line both the inner and outer surfaces of the bilayer, with hydrophobic tails forming the core
Hydrophobic tails line both surfaces with hydrophilic heads forming the core
In a generic animal cell, which structure is described as having a double membrane that delimits the nucleus?
Plasma membrane
Nuclear envelope
Golgi apparatus
Ribosome
Mitochondrial matrix
Which statement best describes the boundary function mentioned for cell membranes?
Membranes synthesize DNA for the cell.
Membranes convert light energy to chemical energy.
The plasma membrane controls what goes into and out of a cell.
The nuclear envelope digests macromolecules.
Cytosol actively transports proteins across membranes.
According to the diagram and notes, which organelle is explicitly identified as containing DNA in a generic animal cell?
Ribosome
Golgi apparatus
Nucleus
Endoplasmic reticulum
Cytoskeleton
Which phrase correctly characterizes cytosol as presented in the material?
A double membrane around the nucleus
A water-based gel-like fluid that surrounds the organelles
A rigid protein network that supports the cell
The extracellular matrix surrounding the cell
The DNA-containing region of the nucleus
Which option reflects one common definition of cytoplasm given in the material?
Only the organelles inside the nucleus
All material outside the plasma membrane
All material inside the plasma membrane, except the nucleus; includes cytosol, ribosomes, cytoskeleton and organelles other than the nucleus
Only the cytosol and nucleus
Only the cytoskeleton and ribosomes
A second school of thought defines cytoplasm as which of the following?
Only organelles other than the nucleus
All material inside the plasma membrane, except the nucleus and other organelles; includes the cytosol, ribosomes and cytoskeleton
All material inside the nucleus
Only the cytosol
All material outside the nucleus including the extracellular matrix
Which statement integrates the role of membranes with organelle structure as described?
All organelles lack membranes in animal cells.
Some organelles have a double membrane (e.g., the nucleus), while others have a single membrane, reflecting the boundary function of membranes.
Only the plasma membrane functions as a boundary; organelles do not have membranes.
Double membranes are found only in ribosomes and cytoskeleton.
Membranes primarily store genetic information.
If a researcher is interested in the material that directly bathes the organelles but excludes the organelles themselves, which term from the material best matches this focus?
Cytoplasm (definition 1)
Cytoplasm (definition 2)
Cytosol
Nuclear envelope
Extracellular matrix
Which statement best describes the basic composition of biological membranes?
A single layer of triglycerides only
A phospholipid bilayer with associated proteins
A cellulose wall with embedded lipids
A cholesterol monolayer with attached carbohydrates
In a phospholipid bilayer, how are the hydrophilic heads and hydrophobic tails oriented?
Hydrophilic heads face inward; hydrophobic tails face the extracellular fluid
Hydrophilic heads face outward; hydrophobic tails face each other
Both heads and tails face outward
Both heads and tails face inward
Which component is directly highlighted as commonly associated with biological membranes?
Proteins
Starch
DNA
Peptidoglycan
Considering the diagram of a typical animal plasma membrane, which feature most directly enables selective transport across the bilayer?
Glycolipids
Channel proteins
Hydrophobic tails
Carbohydrate chains on glycoproteins
Which statement best explains why the hydrophobic tails face each other in the middle of the membrane?
They are repelled by the intracellular fluid and attracted to each other
They form hydrogen bonds with water
They carry positive charges that bind them together
They are enzymatically linked by membrane proteins
Which labeled structure in the diagram contributes most to membrane fluidity in animal cells?
Glycoprotein
Cholesterol
Phospholipid head group
Carbohydrate chain
Which pairing correctly matches a membrane-associated molecule with a distinguishing feature shown or stated?
Glycoprotein — lipid with carbohydrate attached
Glycolipid — protein with carbohydrate attached
Integral membrane protein — spans the bilayer
Peripheral membrane protein — embedded across the phospholipids
Which statement best describes the nuclear envelope?
A single membrane surrounding the nucleus
A double membrane that delimits the nucleus
A protein shell without lipids
A porous carbohydrate layer
What is the primary function of the protein-lined nuclear pores?
DNA replication
Allowing the traffic of molecules into and out of the nucleus
Protein folding
ATP synthesis
Which cellular locations contain DNA according to the material?
Only the nucleus
Nucleus and ribosomes
Nucleus, mitochondria, and chloroplasts (in plants)
Only mitochondria
Chromatin is best described as which of the following?
A lipid- carbohydrate complex
A DNA-protein complex
An RNA-protein complex specialized for translation
A purely proteinaceous scaffold
What specialized role does the nucleolus perform?
DNA replication
Ribosomal subunit synthesis
mRNA export
Chromosome condensation during mitosis
In chromatin, what does DNA represent, and what role do proteins play?
DNA stores energy; proteins perform catalysis
DNA represents information; proteins play a structural role
DNA is structural; proteins carry genetic information
Both DNA and proteins are purely structural
How are chromatin and chromosomes related?
Chromosomes are lipids that organize chromatin
Chromatin is organized into chromosomes
Chromosomes organize proteins into chromatin
They are unrelated structures
For most of the cell cycle, chromosomes exist in which state?
Condensed and distinct
Non-condensed and tangled within the nucleus
Outside the nucleus in the cytosol
Attached to the rough endoplasmic reticulum
During which cellular event do chromosomes condense and become distinct?
Protein translation
Cell division
Transcription
DNA repair
Which statement accurately captures the relationship between DNA and mRNA regarding information flow?
DNA exits the nucleus to deliver information directly to ribosomes
mRNA transfers the information represented by DNA to the cytosol
Proteins carry genetic information from the nucleus to the cytosol
tRNA carries the DNA molecule out through pores
Through which route do mRNA molecules leave the nucleus?
By diffusion through the lipid bilayer of the nuclear envelope
Via transport through protein-lined pores in the nuclear envelope
Encapsulated in vesicles that bud from the nucleolus
Through gap junctions connecting adjacent cells
Which statement about RNA traffic across the nuclear envelope is supported by the material?
Only mRNA can pass through the nuclear pores
No RNA passes through the nuclear pores
mRNA and other types of RNA pass through the pores
Only rRNA passes while mRNA remains in the nucleus
Which process converts DNA information into mRNA as part of genetic information flow?
Translation
Replication
Transcription
Splicing
Where does translation primarily occur in eukaryotic cells according to the material?
In the nucleus
On ribosomes in the cytosol
Inside lysosomes
On the extracellular matrix
Ribosomes are found in which types of cells?
Only eukaryotes
Only prokaryotes
Both eukaryotes and prokaryotes
Only plant cells
Which statement about ribosome structure is correct?
Ribosomes are surrounded by a lipid membrane
Ribosomes consist of a small and a large subunit
Ribosomes are composed only of proteins
Ribosomes contain DNA as their main component
In eukaryotic cells, ribosomes may be attached to which surfaces?
Mitochondrial inner membrane and Golgi lumen
Cytosolic side of the endoplasmic reticulum and cytosolic side of the nuclear envelope
Inner leaflet of the plasma membrane and peroxisomes
Chloroplast thylakoids and lysosomal membrane
What molecules make up ribosomal subunits?
rRNA and ribosome-specific proteins
mRNA and tRNA
DNA and histones
Phospholipids and glycoproteins
Which component provides the instructions that specify the amino acid sequence of a protein during synthesis?
rRNA within the small subunit
mRNA being read by the ribosome
tRNA charging enzymes
DNA in the nucleolus
According to the diagram description, what emerges from the ribosome during translation?
A strand of mRNA is produced
A polypeptide in progress composed of linked amino acids
A DNA duplex
A phospholipid bilayer
Where are ribosomal subunits assembled in eukaryotic cells before exiting to the cytosol?
Endoplasmic reticulum
Golgi apparatus
Nucleolus within the nucleus
Mitochondrial matrix
Which statement best explains why ribosomes can build any protein?
Ribosomes contain all possible amino acids
Ribosomes have a membrane that selects specific substrates
The mRNA sequence dictates the protein’s primary structure, and the ribosome reads this mRNA
Ribosomes store genetic information in rRNA that encodes every protein
Which statement best describes membrane flow in the endomembrane system?
Membranes are rigid and cannot move between organelles.
Many organelles are linked by movement of membranes to and from the plasma membrane.
Only the plasma membrane participates in membrane trafficking.
Membrane flow occurs only during cell division.
Which list correctly identifies components of the endomembrane system?
Nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, plasma membrane, vesicles/vacuoles
Mitochondria, chloroplasts, peroxisomes
Nucleolus, ribosomes, cytoskeleton
Centrosome, microtubules, intermediate filaments
Which organelle is NOT part of the endomembrane system?
Golgi apparatus
Lysosome
Peroxisome
Endoplasmic reticulum
What is the primary role of the endoplasmic reticulum (ER) within the endomembrane system as stated in the material?
It is the source of membrane for the system.
It is the site of ATP production.
It stores genetic information.
It packages DNA into chromosomes.
What does it mean that membranes are fluid in the context of the endomembrane system?
They are solid and rigid.
They are static but compressible.
They can move and be reformed rather than being solid or rigid.
They dissolve in the cytosol.
According to the cell diagram, where can ribosomes be found?
Only free in the cytosol
Only attached to the rough ER
Free in the cytosol and attached to the cytosolic face of the rough ER and nuclear envelope
Only inside the ER lumen
Which statement about the endoplasmic reticulum (ER) is accurate?
It is a set of isolated sacs not connected to other structures.
It is a membrane system running throughout the cytosol and continuous with the nuclear envelope.
It is a DNA-containing organelle.
It functions only in protein degradation.
What term refers to the interior space of the ER?
Matrix
Stroma
Lumen or cisternal space
Intermembrane space
Which function is identified as a major role of the ER for the endomembrane system?
Glycolysis
Membrane synthesis
DNA replication
Photosynthesis
Rough ER is defined by which feature?
Presence of ribosomes on the cytosolic side
Presence of DNA
Absence of membranes
Attachment to mitochondria only
Proteins synthesized by ribosomes attached to the rough ER are released to which location?
Cytosol
Mitochondrial matrix
ER lumen
Golgi cisternae directly
Smooth ER differs from rough ER in which way stated in the material?
Smooth ER lacks membranes.
Smooth ER lacks attached ribosomes and is organized as tubules.
Smooth ER contains DNA and ribosomes.
Smooth ER is continuous with the chloroplast.
Which statement about smooth ER function is supported by the material?
It is primarily responsible for ATP synthesis.
It is a site of membrane synthesis and other cell type–specific functions.
It translates mRNA into DNA.
It forms chromosomes during mitosis.
In liver cells, a specialized function of smooth ER tubules includes which activity?
DNA replication
Detoxification enzyme localization
Photosynthesis
Chromatin condensation
What proportion of the membrane in the endomembrane system resides in the ER, according to the material?
About 10%
About 25%
More than 50%
Exactly 100%
Which statement best integrates structure and continuity of the ER with the nuclear envelope?
The ER is separated from the nucleus by the plasma membrane.
The ER is continuous with the nuclear envelope, allowing membrane flow between them.
The nuclear envelope is part of the mitochondrion.
The ER connects only to lysosomes.
A protein destined for secretion is most likely synthesized by which ribosomes and initially enters which compartment?
Free cytosolic ribosomes; mitochondrial matrix
Rough ER–bound ribosomes; ER lumen
Free cytosolic ribosomes; nucleus
Mitochondrial ribosomes; chloroplast stroma
Which statement best describes the relationship between the endoplasmic reticulum (ER) and the nuclear envelope?
They are separate organelles with no physical connection.
The ER is contiguous with the nuclear envelope.
The nuclear envelope is embedded within the ER lumen.
They only contact during cell division.
In the provided cell diagram, red dots stud the cytosolic surface of a membrane network. What do these red dots represent, and what is their primary function?
Peroxisomes; lipid breakdown
Ribosomes; protein production
Golgi vesicles; glycosylation
Nuclear pores; RNA export
Which feature of the nuclear envelope facilitates selective movement of molecules between nucleus and cytosol?
Single continuous membrane without openings
Protein-lined pores in a double membrane
Channels formed by ribosomes
Gap junctions connecting nuclei
Which statement about mRNA in this context is correct?
mRNA enters the nucleus through pores to be translated.
mRNA leaves the nucleus through pores and carries instructions for protein synthesis.
mRNA is synthesized on ribosomes of the rough ER.
mRNA degrades nuclear pores after export.
A researcher blocks the formation of protein-lined nuclear pores while leaving the double membrane intact. Which immediate cellular consequence is most likely?
Enhanced translation on rough ER due to increased mRNA export
Accumulation of mRNA inside the nucleus with reduced cytosolic protein synthesis
Detachment of the ER from the nuclear envelope
Conversion of rough ER to smooth ER
Which statement distinguishes rough ER from smooth ER as described?
Rough ER is devoid of ribosomes, whereas smooth ER is densely studded with them.
Rough ER has ribosomes on the cytosolic side, whereas smooth ER lacks ribosomes.
Both rough and smooth ER lack ribosomes but differ in membrane thickness.
Only smooth ER is contiguous with the nuclear envelope.
Which structural description best characterizes Golgi bodies in eukaryotic cells?
A single circular membrane sac
A series of flattened membrane-delimited sacs
A rigid protein lattice without membranes
A stack of DNA-filled vesicles
What is the primary source of vesicles that deliver proteins to the Golgi apparatus?
Smooth ER
Rough ER
Mitochondria
Lysosome
The receiving side of the Golgi apparatus is called the _______.
matrix
trans face
cis face
cristae
Which statement best explains the directionality of the Golgi apparatus?
Proteins enter and exit randomly from any side
It has distinct receiving (cis) and shipping (trans) sides
Only lipids move through the Golgi
Directionality refers to DNA replication orientation
Which pair lists the two main functions of the Golgi apparatus as described?
ATP synthesis and calcium storage
Lipid breakdown and detoxification
Protein modification and protein sorting
DNA replication and transcription
According to the diagram, where do transport vesicles from the rough ER fuse to release their contents?
Trans face of the Golgi
Cis face of the Golgi
Plasma membrane
Lysosome
Which modification commonly occurs to proteins as they move through the Golgi apparatus?
Phospholipid removal
Addition of oligosaccharide side chains
Insertion of introns
Denaturation to expose peptide bonds
Where are proteins located immediately after they are synthesized by ribosomes attached to the rough ER?
In the cytosol
In the lumen of the ER
In the nucleus
In the lysosome
What happens after a transport vesicle carrying a protein from the rough ER reaches the Golgi?
It dissolves in the cytosol
It fuses with the Golgi and releases the protein inside
It is degraded by lysosomal enzymes
It immediately exocytoses at the plasma membrane
Which sequence accurately traces the pathway of a secreted protein based on the material?
Cytosol → Nucleus → Golgi → Plasma membrane
Rough ER lumen → Transport vesicle → Golgi → Secretory vesicle → Plasma membrane
Mitochondria → Lysosome → Golgi → Rough ER
Rough ER membrane → Cytosol → Plasma membrane
What is the role of the trans face of the Golgi apparatus?
Receiving proteins from the rough ER
Site of ribosome attachment
Shipping proteins out in vesicles to varied locations
Synthesizing DNA
Proteins processed by the Golgi can be sent to which final destinations mentioned?
Nucleolus or chloroplast
Outside of the cell or lysosome
Peroxisome or mitochondrion
Centrosome or cytoskeleton
Vesicles from the Golgi that fuse with the plasma membrane release their contents by which process?
Endocytosis
Pinocytosis
Exocytosis
Autophagy
Which statement best describes protein sorting by the Golgi apparatus?
Proteins are randomly packed into vesicles without signals
Proteins are directed into vesicles that send them to their final destinations
Proteins are only sent to the nucleus
Sorting only occurs in the rough ER
In the context of the provided material, which event directly precedes exocytosis of a secretory protein?
Fusion of a transport vesicle with the cis face
Fusion of a vesicle from the Golgi with the plasma membrane
Addition of introns to the protein
Attachment of ribosomes to the plasma membrane
Which statement best defines membrane flow in eukaryotic cells?
The movement of cytoskeletal filaments through the cytosol
The transfer of membrane from one organelle to another and to/from the plasma membrane within the endomembrane system
The diffusion of lipids within a single membrane bilayer
The active transport of ions across membranes
Where does membrane flow originate within the endomembrane system?
Mitochondrial inner membrane
Plasma membrane
Endoplasmic reticulum (site of membrane synthesis)
Peroxisome
Which membrane is NOT part of the endomembrane system and therefore does not receive membrane flow as described?
Golgi body
Lysosome
Plasma membrane
Mitochondrial membrane
Based on the schematic of membrane flow, which sequence correctly represents a possible route of a vesicle carrying membrane components?
ER → nucleus → mitochondrion
ER → Golgi body → plasma membrane
Plasma membrane → ER → Golgi body
Nuclear envelope → lysosome → ER
In the context of the endomembrane system, what is the nuclear envelope’s relationship to membrane flow?
It is a membrane sink unrelated to ER synthesis.
It can receive membrane derived from the ER.
It exports membrane directly to mitochondria.
It prevents vesicle fusion.
Which description best characterizes an amoeba relevant to this section?
A multicellular prokaryote that photosynthesizes
A unicellular eukaryote (protist) that feeds by phagocytosis
A multicellular fungus that absorbs nutrients
A unicellular bacterium with peptidoglycan cell wall
What immediate structure forms when an amoeba engulfs an extracellular food particle?
Primary lysosome
Phagosome (food vesicle/food vacuole) derived from the plasma membrane
Autophagosome derived from ER
Endosome derived from the nuclear envelope
Which fusion event leads to formation of a phagolysosome in amoebas?
Phagosome with rough ER
Phagosome with lysosome
Lysosome with nucleus
Golgi with plasma membrane
Where do the digestive (hydrolytic) enzymes inside lysosomes ultimately originate?
They are synthesized on free cytosolic ribosomes and remain there.
They are produced at the rough ER and delivered via vesicles from the Golgi.
They are imported from outside the cell.
They are synthesized by mitochondrial ribosomes.
During amoeba feeding, what is expelled at the end of the process illustrated?
Undigested waste after the post-digestion phase
Lysosomal enzymes into the cytosol
The nucleus through exocytosis
Hydrogen ions across the plasma membrane
Which step would be most directly impaired if vesicle trafficking from the Golgi to lysosomes were blocked?
Formation of the phagosome
Availability of hydrolytic enzymes in lysosomes
Engulfment by pseudopods
Exocytosis of waste
Which statement best summarizes the classical secretory pathway shown?
Proteins are synthesized in the cytosol and directly secreted through pores in the plasma membrane.
Proteins produced on the rough ER enter the ER lumen, move via vesicles to the Golgi for modification, and then in vesicles to the plasma membrane or lysosome.
Proteins are synthesized in mitochondria and transported to the Golgi for secretion.
Proteins move from the nucleus to the ER and then are degraded in lysosomes only.
In the review diagram, what event releases a protein to the outside of the cell?
Fusion of a vesicle with the plasma membrane
Fusion of a vesicle with the ER membrane
Fusion of a vesicle with the nuclear envelope
Fusion of lysosome with the Golgi
Which location is explicitly labeled as the inside of the ER in the review figure?
Matrix
Stroma
Lumen of ER
Cytosol
A protein destined for lysosomes follows which route according to the diagram?
Cytosol → nucleus → lysosome
Rough ER lumen → transport vesicle → Golgi body → vesicle → lysosome
Golgi body → nucleus → lysosome
Plasma membrane → ER → lysosome
Considering membrane flow, which statement best explains why mitochondrial membranes are compositionally distinct from the ER-derived membranes?
Mitochondria continuously receive membrane from the ER.
Mitochondrial membranes are not part of the endomembrane system and do not participate in membrane flow from the ER.
The Golgi modifies mitochondrial inner membrane proteins directly.
Mitochondria form from lysosomes during phagocytosis.
Which organelles are explicitly identified as not part of the endomembrane system?
Peroxisomes and mitochondria
Endoplasmic reticulum and Golgi apparatus
Lysosomes and secretory vesicles
Nucleus and nucleolus
Peroxisomes are best described as which of the following?
Double-membrane organelles dedicated to protein synthesis
Small single-membrane organelles involved in oxidative reactions
Non-membranous structures that store calcium
Double-membrane vesicles specialized for photosynthesis
