Which of the following amino acids would most likely be present in the transmembrane domain of an integral membrane protein?

a hydrophobic amino acid like valine

a charged amino acid like lysine

a special amino acid like glycine or proline

any of the above, with no preference

In a paramecium (a single-celled eukaryote), cell surface integral membrane proteins are synthesized

by ribosomes bound to the rough endoplasmic reticulum.

in the cytoplasm by free ribosomes.

by ribosomes in the Golgi vesicles.

by ribosomes bound to the inner surface of the plasma membrane.

The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is

to mediate cell-to-cell recognition.

to facilitate diffusion of molecules down their concentration gradients.

to actively transport molecules against their concentration gradients.

to maintain the integrity of a fluid mosaic membrane.

to maintain membrane fluidity at low temperatures.

What kinds of molecules pass through a cell membrane most easily?

monosaccharides such as glucose

Water passes quickly through cell membranes because

it moves through aquaporins in the membrane.

it moves through hydrophobic channels.

water movement is tied to ATP hydrolysis.

it is a small, polar, charged molecule.

Which of the following is a characteristic feature of a carrier protein in a plasma membrane?

It exhibits a specificity for a particular type of molecule.

It is a peripheral membrane protein.

It requires the expenditure of cellular energy to function.

It has few, if any, hydrophobic amino acids.

Which of the following statements is correct about diffusion?

It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

It is very rapid over long distances.

It requires an expenditure of energy by the cell.

It is an active process (requires expenditure of energy by the cell) in which molecules move from a region of lower concentration to one of higher concentration.

It requires integral proteins in the cell membrane.

Which of the following processes includes all others?

a channel protein allowing the diffusion of a solute across a membrane

a carrier protein allowing the diffusion of an ion down its concentration gradient

Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?

The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

The animal cell is in a hypotonic solution, and the plant cell is in an isotonic solution.

The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution.

The animal cell is in a hypertonic solution, and the plant cell is in an isotonic solution.

The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution.

When a plant cell is submerged in a hypotonic solution, what is likely to occur?

Plasmolysis will shrink the interior.

Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater?

Water will leave the cells, causing them to shrivel and collapse.

NaCl will be exported from the red blood cells by facilitated diffusion.

The blood cells will take up water, swell, and eventually burst.

NaCl will passively diffuse into the red blood cells.

The blood cells will expend ATP for active transport of NaCl into the cytoplasm.

Ions diffusing across membranes through specific ion channels generally do so

down their electrochemical gradients.

down their concentration gradients.

down the osmotic potential gradients.

The movement of potassium ions (K+) into an animal cell AGAINST its concentration gradient requires

low cellular concentrations of sodium.

high cellular concentrations of potassium.

The sodium-potassium pump of animal cells is called an electrogenic pump because it

contributes to the membrane potential.

pumps equal quantities of Na+ and K+ across the membrane.

pumps hydrogen ions out of the cell.

ionizes sodium and potassium atoms.

is used to drive the transport of other molecules against a concentration gradient.

The difference between pinocytosis and receptor-mediated endocytosis is that

pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity.

pinocytosis brings only water molecules into the cell, but receptor-mediated endocytosis brings in other molecules as well.

pinocytosis increases the surface area of the plasma membrane whereas receptor-mediated endocytosis decreases the plasma membrane surface area.

pinocytosis requires cellular energy, but receptor-mediated endocytosis does not.

pinocytosis can concentrate substances from the extracellular fluid, but receptor-mediated endocytosis cannot.

Familial hypercholesterolemia is characterized by which of the following?

defective LDL receptors on the cell membranes

poor attachment of the cholesterol to the extracellular matrix of cells

a poorly formed lipid bilayer that cannot incorporate cholesterol into cell membranes

inhibition of the cholesterol active transport system in red blood cells

a general lack of glycolipids in the blood cell membranes

In order for a protein to be an integral membrane protein it would have to be

amphipathic, with at least one hydrophobic region.

completely covered with phospholipids.

exposed on only one surface of the membrane.

Which of the following is true of integral membrane proteins?

They are usually transmembrane proteins.

They are loosely bound to the surface of the bilayer.

They are not mobile within the bilayer.

They serve only a structural role in membranes.

Cell membranes are asymmetrical (they have distinct inside and outside faces). Which of the following is the most likely explanation?

The two sides of a cell membrane face different environments and carry out different functions.

The cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium.

Cell membranes communicate signals from one organism to another.

The "innerness" and "outerness" of membrane surfaces are predetermined by genes.

Proteins can only be associated with the cell membranes on the cytoplasmic side.

According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly

spread in a continuous layer over the inner and outer surfaces of the membrane.

confined to the hydrophobic interior of the membrane.

randomly oriented in the membrane, with no fixed inside-outside polarity.

free to depart from the fluid membrane and dissolve in the surrounding solution.

Which of the following factors would tend to increase membrane fluidity?

a greater proportion of unsaturated phospholipids

a greater proportion of saturated phospholipids

a relatively high protein content in the membrane

a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses

An animal cell lacking oligosaccharides (short polysaccharides) on the external surface of its plasma membrane would likely be impaired in which function?

transporting ions against an electrochemical gradient

maintaining fluidity of the phospholipid bilayer

establishing the diffusion barrier to charged molecules

An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different aqueous solution, called the “environment”, as shown above. The membrane of the cell is PERMEABLE to water and to the simple sugars glucose and fructose, but IMPERMEABLE to the disaccharide sucrose. During the course of the experiment, the NET movement of glucose and fructose into and /or out of the artificial cell would be

glucose out of the cell and fructose into the cell

glucose into the cell and fructose out of the cell

glucose into the cell and fructose into the cell

glucose out of the cell and fructose out of the cell

no net movement of either sugar

An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different aqueous solution, called the “environment”, as shown above. The membrane of the cell is PERMEABLE to water and to the simple sugars glucose and fructose, but IMPERMEABLE to the disaccharide sucrose. At the very beginning of the experiment (before any molecules have diffused), is the solution OUTSIDE THE CELL isotonic, hypotonic or hypertonic to the solution inside of the cell and why?

The solution outside the cell is HYPOTONIC, because the total solute concentration is less outside the cell than inside the cell.

The solution outside the cell is HYPERTONIC, because the total solute concentration is less outside the cell than inside the cell.

The solution outside the cell is HYPOTONIC, because the total solute concentration is greater outside the cell than inside the cell.

The solution outside the cell is ISOTONIC, because the total solute concentration is equal in concentration to the inside the cell.

The solution outside the cell is ISOTONIC, because the solutes that can actually diffuse, glucose and fructose, are equal in concentration to the glucose inside the cell.

An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different aqueous solution, called the “environment”, as shown above. The membrane of the cell is PERMEABLE to water and to the simple sugars glucose and fructose, but IMPERMEABLE to the disaccharide sucrose. During the course of this experiment, the NET osmosis (direction of net water movement), is

there is no net movement of water

An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different aqueous solution, called the “environment”, as shown above. The membrane of the cell is PERMEABLE to water and to the simple sugars glucose and fructose, but IMPERMEABLE to the disaccharide sucrose. Over time, will the artificial cell shown in the figure become more flaccid, more turgid, or stay the same and why?

It will become MORE TURGID over time as water moves into the cell because that is where there is a higher solute concentration at the beginning of the experiment.

It will become MORE FLACCID over time as water moves into the cell because that is where there is a higher solute concentration at the beginning of the experiment.

It will become MORE TURGID over time as water moves out of the cell because that is where there is a higher solute concentration at the beginning of the experiment.

It will become MORE FLACCID over time as water moves out of the cell because that is where there is a higher solute concentration at the beginning of the experiment.

It will STAY THE SAME over time as water moves into and out of the cell at the same rate throughout the experiment.

An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different aqueous solution, called the “environment”, as shown above. The membrane of the cell is PERMEABLE to water and to the simple sugars glucose and fructose, but IMPERMEABLE to the disaccharide sucrose. Eventually, will the two solutions shown in the figure, that is the solution in the artificial cell and the solution in the environment, have the same or different solute concentrations and why?

Eventually, the two solutions will have THE SAME solute concentrations because even though sucrose can’t move through the membrane, water flow (osmosis) into the cell will change the volumes and lead to isotonic conditions.

The two solutions will always have DIFFERENT solute concentrations because the membrane of the cell is impermeable to sucrose, so sucrose can never leave the artificial cell.

Eventually, the two solutions will have THE SAME solute concentrations because even though sucrose can’t move through the membrane, the flow of glucose and fructose into and out of the cell will change the solute concentrations until isotonic conditions are reached.

Eventually, the two solutions will have THE SAME solute concentrations because even though sucrose can’t move through the membrane, water flow (osmosis) out of the cell will change the volumes and lead to isotonic conditions.

A cell with a predominance of free ribosomes is most likely

producing primarily cytoplasmic proteins.

producing primarily proteins for secretion.

constructing an extensive cell wall or extracellular matrix.

digesting large food particles.

Explain the reasoning behind the correct answer for producing primarily cytoplasmic proteins.

Generally, proteins made by free ribosomes remain within the cell and perform functions in the cytosol.

Generally, proteins made by bound ribosomes remain within the cell and perform functions in the cytosol.

Generally, proteins made by free ribosomes are used to construct the vacuole.

Generally, proteins made by free ribosomes are secreted from the cell or inserted into cellular membranes.

Generally, free ribosomes are involved in producing hydrolytic enzymes that digest large food particles.

What types of proteins that function in the locations listed below are NOT synthesized in the rough ER?

endoplasmic reticulum (ER) proteins

extracellular matrix (ECM) proteins

Explain the reasoning behind the correct answer, cytosolic proteins

Cytosolic proteins are not synthesized by the rough ER because the cytosol is not part of the cell's endomembrane system, nor is it located outside of the cell therefore, these proteins would not be produced by a ribosome attached to the ER.

ER proteins are not synthesized by the rough ER because the ER is not part of the cell's endomembrane system, nor is it located outside of the cell therefore, these proteins would not be produced by a ribosome attached to the ER.

ECM proteins are not synthesized by the rough ER because the ECM is not part of the cell's endomembrane system, nor is it located outside of the cell therefore, these proteins would not be produced by a ribosome attached to the ER.

Golgi proteins are not synthesized by the rough ER because the Golgi is not part of the cell's endomembrane system, nor is it located outside of the cell therefore, these proteins would not be produced by a ribosome attached to the ER.

PM proteins are not synthesized by the rough ER because the plasma membrane is not part of the cell's endomembrane system, nor is it located outside of the cell therefore, these proteins would not be produced by a ribosome attached to the ER.

What is the most likely pathway taken by a newly synthesized protein that will be secreted by a cell?

ER →Golgi →vesicles that fuse with plasma membrane

ER →lysosomes →vesicles that fuse with plasma membrane

Bio exam 2

Authored by Emily Costello

Biology

University

NGSS covered

Used 2+ times

AI Actions

Add similar questions

Adjust reading levels

Convert to real-world scenario

Translate activity

More...

Content View

Student View

143 questions

Show all answers

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

Which of the following types of molecules are the major structural components of the cell membrane?

phospholipids and cellulose

nucleic acids and proteins

phospholipids and proteins

proteins and cellulose

glycoproteins and cholesterol

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?

They can move laterally along the plane of the membrane.

They frequently flip-flop from one side of the membrane to the other.

They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane.

They are free to depart from the membrane and dissolve in the surrounding solution.

They have hydrophilic tails in the interior of the membrane.

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures?

Unsaturated fatty acids have a higher cholesterol content and therefore more cholesterol in membranes.

The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly.

Unsaturated fatty acids are more polar than saturated fatty acids.

The double bonds block interaction among the hydrophilic head groups of the lipids.

The double bonds result in shorter fatty acid tails and thinner membranes.

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

The presence of cholesterol in the plasma membranes of some animals

enables the membrane to stay fluid more easily when cell temperature drops.

enables the animal to remove hydrogen atoms from saturated phospholipids.

enables the animal to add hydrogen atoms to unsaturated phospholipids.

makes the membrane less flexible, allowing it to sustain greater pressure from within the cell.

makes the animal more susceptible to circulatory disorders.

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?

by decreasing the number of hydrophobic proteins in the membrane

by increasing the percentage of cholesterol molecules in the membrane

by increasing the percentage of unsaturated phospholipids in the membrane

by cotransport of glucose and hydrogen

by using active transport

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

In what way do the membranes of a eukaryotic cell vary?

Phospholipids are found only in certain membranes.

Certain proteins are unique to each membrane.

Only certain membranes of the cell are selectively permeable.

Only certain membranes are constructed from amphipathic molecules.

Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm.

MULTIPLE CHOICE QUESTION

20 mins • 1 pt

A protein that spans the entire phospholipid bilayer of a membrane one or more times is

a transmembrane protein.

an integral protein.

a peripheral protein.

an integrin.

a glycoprotein.

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Continue with Google

Continue with Email

Continue with Classlink

Continue with Clever

or continue with

Microsoft

Apple

Others

Already have an account?

Popular Resources on Wayground

10 questions

Main Idea and Supporting Details

Quiz

•

3rd - 6th Grade

20 questions

Math Review

Quiz

•

3rd Grade

14 questions

25-26 SY 8th Grade EOY Benchmark

Quiz

•

8th Grade

15 questions

Fast food

Quiz

•

7th Grade

20 questions

Math Review

Quiz

•

6th Grade

20 questions

Context Clues

Quiz

•

6th Grade

21 questions

EOY Grade 6 Benchmark Assessment - Content Skills

Quiz

•

6th Grade

20 questions

Inferences

Quiz

•

4th Grade

Discover more resources for Biology

55 questions

Mock EOC/ Interim 3 Review

Quiz

•

KG - University

Bio exam 2

Which of the following types of molecules are the major structural components of the cell membrane?

According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?

Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures?

The presence of cholesterol in the plasma membranes of some animals

Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?

In what way do the membranes of a eukaryotic cell vary?

A protein that spans the entire phospholipid bilayer of a membrane one or more times is

Which of these are not embedded in the hydrophobic portion of the phospholipid bilayer at all?

Which of the following amino acids would most likely be present in the transmembrane domain of an integral membrane protein?

In a paramecium (a single-celled eukaryote), cell surface integral membrane proteins are synthesized

Access all questions and much more by creating a free account

Popular Resources on Wayground

Discover more resources for Biology