WorksheetsMicroscopy and Cell Biology Quiz
Total questions: 30
Worksheet time: 15mins
Which scientist created his own microscopes and observed 'animalcules'?
Anton van Leeuwenhoek
Robert Hook
Charles Darwin
Gregor Mendel
What type of microscope uses visible light passed through a specimen and can achieve up to ~1,000x life-size magnification?
Light microscope (LM)
Electron microscope
Scanning probe microscope
Confocal microscope
Why are most subcellular structures, including organelles, too small to be resolved by light microscopy?
Their size is below the resolution limit of light microscopes
They are too bright
They move too quickly
They are only visible at night
What is a basic feature found in all cells?
Nucleus
Plasma membrane
Mitochondria
Cell wall
Which of the following statements best describes the plasma membrane?
It is a rigid structure made of cellulose.
It is a selective barrier that allows passage of oxygen, nutrients, and waste.
It is only found in prokaryotic cells.
It is a single layer of proteins.
Why is the ratio of surface area to volume critical for cells?
It determines the number of chromosomes.
It affects the cell's ability to exchange materials with its environment.
It controls the number of ribosomes.
It determines the type of organism.
Which of the following is true about prokaryotic cells compared to eukaryotic cells?
Prokaryotic cells contain membrane-bound organelles.
Prokaryotic cells are usually larger than eukaryotic cells.
Prokaryotic cells have no nucleus.
Prokaryotic cells have DNA in the nucleus.
Which of the following best explains why small cells have a greater surface area to volume ratio?
They have more organelles.
Their surface area increases faster than their volume as they get smaller.
They contain more DNA.
Their volume increases faster than their surface area as they get smaller.
What is the main function of ribosomes in a eukaryotic cell?
Storing genetic information
Synthesizing proteins
Regulating entry and exit of molecules
Producing energy
Which structure encloses the nucleus and separates DNA from the cytoplasm?
Plasma membrane
Nuclear envelope
Golgi apparatus
Lysosome
What are the two locations where ribosomes carry out protein synthesis?
Mitochondria and cytosol
Cytosol and on the outside of the endoplasmic reticulum/nuclear envelope
Nucleus and lysosome
Golgi apparatus and vacuole
Which of the following is NOT part of the endomembrane system?
Nuclear envelope
Plasma membrane
Mitochondria
Golgi apparatus
Why is the nucleolus important for the cell?
It is the site of ribosomal RNA (rRNA) synthesis.
It regulates the entry and exit of molecules.
It stores genetic information.
It produces energy for the cell.
Which structure is described as the "Shipping & Receiving Center" of the cell?
Lysosome
Golgi Apparatus
Smooth ER
Rough ER
The rough endoplasmic reticulum (Rough ER) is distinguished from the smooth ER by which feature?
Contains hydrolytic enzymes
Lacks ribosomes
Surface is studded with ribosomes
Stores calcium ions
Which of the following best explains how the Golgi apparatus contributes to protein processing in the cell? (DoK Level 2)
It synthesizes proteins from amino acids.
It modifies, sorts, and packages proteins received from the ER into transport vesicles.
It digests proteins using hydrolytic enzymes.
It stores proteins for later use.
A scientist observes a cell that is unable to detoxify alcohol and barbiturates efficiently. Which organelle is most likely malfunctioning, and why? (DoK Level 3)
Lysosome, because it digests macromolecules.
Smooth ER, because it detoxifies drugs and poisons.
Golgi apparatus, because it sorts proteins.
Rough ER, because it secretes glycoproteins.
Which process involves enzymes within lysosomes recycling the cell’s own organelles and macromolecules?
Autophagy
Phagocytosis
Photosynthesis
Cellular respiration
What is the main function of contractile vacuoles in cells?
Pump excess water out of cells
Store water and ions
Digest molecules
Generate ATP
Where are central vacuoles typically found?
In many plant cells
In animal cells only
In bacteria
In mitochondria
Which of the following is evidence supporting the endosymbiont theory for mitochondria and chloroplasts?
They contain a single membrane
They lack ribosomes
They contain their own DNA
They cannot reproduce independently in cells
What is the function of the mitochondrial matrix?
It is the site of photosynthesis
It is the site where some metabolic steps of cellular respiration occur
It stores chlorophyll
It is the protective barrier of the mitochondria
What is the main function of peroxisomes in eukaryotic cells?
Capture light energy
Detoxify various molecules
Store genetic information
Produce ATP through glycolysis
A scientist observes an organelle with a double membrane, its own DNA, and ribosomes. Which organelle could this be, and what does this observation support?
Peroxisome; supports the theory of spontaneous generation
Chloroplast; supports the endosymbiont theory
Nucleus; supports the cell theory
Lysosome; supports the endosymbiont theory
Explain how the structure of the inner mitochondrial membrane contributes to its function in energy conversion.
The smooth surface allows for rapid diffusion of molecules
The folding into cristae increases surface area for metabolic reactions
The presence of chlorophyll enables photosynthesis
The single membrane prevents entry of all molecules
Which of the following is NOT a role of the cytoskeleton in the cell?
Organizes cell's structures and activities
Provides mechanical support and maintains cell shape
Produces energy for cellular respiration
Provides anchorage for many organelles and molecules
Microfilaments are primarily involved in which of the following cellular processes?
Separating chromosomes during cell division
Composing the core of microvilli of intestinal cells
Forming the nuclear envelope
Synthesizing proteins
Which component of the extracellular matrix (ECM) is responsible for binding to cell-surface receptor proteins in animal cells?
ECM proteins
Cellulose microfibrils
Chlorophyll
Phospholipids
Which type of cell junction is primarily found in muscle cells and overlying skin, providing mechanical stability?
Desmosomes
Gap junctions
Tight junctions
Plasmodesmata
Explain why the presence of channels between membrane protein pores is particularly important in heart cells. Use your understanding of cell communication and function to support your answer.
They allow rapid communication and coordination between heart cells, which is essential for synchronized contraction.
They help heart cells store more nutrients.
They increase the number of mitochondria in heart cells.
They prevent the passage of ions between heart cells.
