Question 1

Matt is studying how the protein transferrin enters cells.He examines cells that have taken up transferrin,and finds clathrin-coated vesicles.What mechanism was used to take transferrin into the cell?

Accepted Answer

A)  Phagocytosis
B)  Pinocytosis
C)  Exocytosis
D)  Receptor-mediator endocytosisE) A) and D)
F) A) and B)

Question 2

The cell's plasma membrane mediates which of the following transactions with the environment? Choose all that apply.

Accepted Answer

A)  Ingesting food molecules and sometimes entire cells
B)  Returning waste and other molecules back to the environment
C)  Responding to a host of chemical cues
D)  Directing synthesis of various food-digesting proteins
E)  Passing messages to other cellsF) B) and D)
G) A) and C)

Question 3

Red blood cells are biconcave.Their shape is determined by interior proteins anchored to the membrane termed

Accepted Answer

A)  clathrins.
B)  phospholipids.
C)  cytoskeleton.
D)  spectrins.
E)  actin filaments.F) B) and E)
G) A) and C)

Question 4

On the outer surface of the plasma membrane there are marker molecules that identify the cell type.Often these molecules are

Accepted Answer

A)  ATP.
B)  amino acids.
C)  nucleotides.
D)  carbohydrate chains.
E)  inorganic ions.F) C) and E)
G) A) and C)

Question 5

During neuronal signaling,a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell.Which of the following helps establish the concentration gradient necessary for this process to occur?

Accepted Answer

A)  Na+/K+ channel
B)  voltage-gated Na+ channel
C)  Na+ symporter
D)  Na+/K+ pumpE) All of the above
F) A) and D)

Question 6

GABA receptors play an essential role in neurotransmission in the central nervous system.In response to the appropriate signal,these receptors open up and allow Cl- to flow into the cell.Given this information,GABA receptors can be classified as a

Accepted Answer

A)  gated ion channel.
B)  gated carrier protein.
C)  symporter.
D)  Cl- pump.E) All of the above
F) None of the above

Question 7

How are the tails and heads of membrane phospholipids oriented in their environment?

Accepted Answer

A)  The hydrophobic heads are oriented toward each other and the hydrophillic tails are oriented toward the extracellular fluid and the intracellular fluid.
B)  The hydrophillic tails are oriented toward each other and the hydrophobic heads are oriented toward the extracellular fluid and the intracellular fluid.
C)  The hydrophobic tails are oriented toward each other and the hydrophillic heads are oriented toward the extracellular fluid and the intracellular fluid.
D)  The hydrophillic heads are oriented toward each other and the hydrophobic tails are oriented toward the extracellular fluid and the intracellular fluid.E) None of the above
F) A) and D)

Question 8

The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are

Accepted Answer

A)  highly polar.
B)  negatively charged.
C)  nonpolar.
D)  positively charged.
E)  water soluble.F) B) and E)
G) None of the above

Question 9

Protein X contains four transmembrane domains,a short N-terminus and a long C-terminus.Following protein synthesis,the N-terminus of the protein faces the lumen (the inside) of the ER.After protein X is transported to the cell surface via exocytosis,you would expect the N-terminus of protein X to be

Accepted Answer

A)  extracellular.
B)  cytoplasmic.
C)  in the lumen.
D)  in the lipid bilayer of the plasma membrane.E) B) and D)
F) None of the above

Question 10

Insulin stimulates an increase in number of glucose carrier proteins at a cell membrane's surface.What effect will insulin have on cell function? Choose all that apply.

Accepted Answer

A)  An increase in insulin,which will increase the diffusion rate.
B)  ATP amounts needed for this transport will increase.
C)  Low insulin levels will decrease the number of available carrier proteins.
D)  Lack of membrane receptors for insulin will decrease amount of glucose taken in.E) A) and C)
F) A) and B)

Question 11

Membrane potential will affect the directional movement of

Accepted Answer

A)  Glucose (C6H12O6) 
B)  Cholesterol
C)  Potassium (K+) 
D)  Oxygen (O2) E) C) and D)
F) A) and B)

Question 12

When the solute concentration of solution A is lower than the solute concentration of solution B,solution A is considered

Accepted Answer

A)  hypertonic.
B)  hypotonic.
C)  isotonic.D) None of the above
E) A) and B)

Question 13

If you were a very thirsty cell,which process would you use to take in some nutrients secreted by one of your neighbors?

Accepted Answer

A)  Phagocytosis
B)  Pinocytosis
C)  Receptor-mediated endocytosis
D)  ExocytosisE) A) and B)
F) B) and C)

Question 14

The plasma membrane is a thin sheet of lipid embedded with

Accepted Answer

A)  proteins.
B)  carbohydrates.
C)  polymers.
D)  nucleotides.
E)  sodium and potassium ions.F) C) and E)
G) A) and E)

Question 15

Membrane proteins are not very soluble in water,because they possess long stretches of non-polar amino acids that are

Accepted Answer

A)  too long to interact with the water molecules.
B)  hydrophobic.
C)  are transmembranal.
D)  hydrophilic.
E)  used as transport channels.F) D) and E)
G) B) and E)

Question 16

If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg,what will happen to the cell?

Accepted Answer

A)  The cell will lose water and its osmotic pressure will decrease.
B)  The cell will gain water and its osmotic pressure will decrease.
C)  The cell will gain water and its osmotic pressure will increase.
D)  The cell will lose water and its osmotic pressure will increase.E) A) and B)
F) B) and D)

Question 17

While eating lobster for dinner one night your friend asks what you think might happen if this marine invertebrate,which is normally isosmotic with respect to the surrounding seawater,were to be moved to a bay with a slightly lower salt concentration instead of being caught.You reply that,in order for the lobster to be isosmotic with respect to new environment,

Accepted Answer

A)  it must move water in to match the solute concentration of its new environment.
B)  it regulates its internal concentration of solutes to match that of its new environment.
C)  it must move water out to match the solute concentration of its new environment.
D)  it moves water in or out and regulates its internal concentration of water as needed.E) None of the above
F) B) and D)

Question 18

What is the main component of an animal cell membrane?

Accepted Answer

A)  phospholipids
B)  polynucleotides
C)  aquaporins
D)  glycolipids
E)  cholesterolF) D) and E)
G) A) and E)

Question 19

Carrier-mediated transport of a substance down its concentration gradient is called

Accepted Answer

A)  facilitated diffusion.
B)  active transport.
C)  exocytosis.
D)  endocytosis.
E)  phagocytosis.F) A) and D)
G) A) and C)

Question 20

The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called ________.

Accepted Answer

A)  phospholipids
B)  fats
C)  proteins
D)  carbohydratesE) B) and C)
F) C) and D)

Exam 5: Membranes

What is the main component of an animal cell membrane?

Correct Answer
verified

On the outer surface of the plasma membrane there are marker molecules that identify the cell type.Often these molecules are

Correct Answer
verified

When the solute concentration of solution A is lower than the solute concentration of solution B,solution A is considered

Correct Answer
verified

Matt is studying how the protein transferrin enters cells.He examines cells that have taken up transferrin,and finds clathrin-coated vesicles.What mechanism was used to take transferrin into the cell?

Correct Answer
verified

The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called ________.

Correct Answer
verified

Correct Answer
verified

Red blood cells are biconcave.Their shape is determined by interior proteins anchored to the membrane termed

Correct Answer
verified

The cell's plasma membrane mediates which of the following transactions with the environment? Choose all that apply.

Correct Answer
verified

Protein X contains four transmembrane domains,a short N-terminus and a long C-terminus.Following protein synthesis,the N-terminus of the protein faces the lumen (the inside) of the ER.After protein X is transported to the cell surface via exocytosis,you would expect the N-terminus of protein X to be

Correct Answer
verified

The plasma membrane is a thin sheet of lipid embedded with

Correct Answer
verified

If you were a very thirsty cell,which process would you use to take in some nutrients secreted by one of your neighbors?

Correct Answer
verified

Membrane potential will affect the directional movement of

Correct Answer
verified

If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg,what will happen to the cell?

Correct Answer
verified

The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are

Correct Answer
verified

How are the tails and heads of membrane phospholipids oriented in their environment?

Correct Answer
verified

GABA receptors play an essential role in neurotransmission in the central nervous system.In response to the appropriate signal,these receptors open up and allow Cl^- to flow into the cell.Given this information,GABA receptors can be classified as a

Correct Answer
verified

During neuronal signaling,a change in membrane potential will cause sodium channels to open and let Na⁺ ions diffuse down their concentration gradient into the cell.Which of the following helps establish the concentration gradient necessary for this process to occur?

Correct Answer
verified

Carrier-mediated transport of a substance down its concentration gradient is called

Correct Answer
verified

Membrane proteins are not very soluble in water,because they possess long stretches of non-polar amino acids that are

Correct Answer
verified

Insulin stimulates an increase in number of glucose carrier proteins at a cell membrane's surface.What effect will insulin have on cell function? Choose all that apply.

Correct Answer
verified

Exam 5: Membranes

What is the main component of an animal cell membrane?

Correct AnswerverifiedShow Answer

On the outer surface of the plasma membrane there are marker molecules that identify the cell type.Often these molecules are

Correct AnswerverifiedShow Answer

When the solute concentration of solution A is lower than the solute concentration of solution B,solution A is considered

Correct AnswerverifiedShow Answer

Matt is studying how the protein transferrin enters cells.He examines cells that have taken up transferrin,and finds clathrin-coated vesicles.What mechanism was used to take transferrin into the cell?

Correct AnswerverifiedShow Answer

The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Red blood cells are biconcave.Their shape is determined by interior proteins anchored to the membrane termed

Correct AnswerverifiedShow Answer

The cell's plasma membrane mediates which of the following transactions with the environment? Choose all that apply.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The plasma membrane is a thin sheet of lipid embedded with

Correct AnswerverifiedShow Answer

If you were a very thirsty cell,which process would you use to take in some nutrients secreted by one of your neighbors?

Correct AnswerverifiedShow Answer

Membrane potential will affect the directional movement of

Correct AnswerverifiedShow Answer

If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg,what will happen to the cell?

Correct AnswerverifiedShow Answer

The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are

Correct AnswerverifiedShow Answer

How are the tails and heads of membrane phospholipids oriented in their environment?

Correct AnswerverifiedShow Answer

GABA receptors play an essential role in neurotransmission in the central nervous system.In response to the appropriate signal,these receptors open up and allow Cl- to flow into the cell.Given this information,GABA receptors can be classified as a

Correct AnswerverifiedShow Answer

During neuronal signaling,a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell.Which of the following helps establish the concentration gradient necessary for this process to occur?

Correct AnswerverifiedShow Answer

Carrier-mediated transport of a substance down its concentration gradient is called

Correct AnswerverifiedShow Answer

Membrane proteins are not very soluble in water,because they possess long stretches of non-polar amino acids that are

Correct AnswerverifiedShow Answer

Insulin stimulates an increase in number of glucose carrier proteins at a cell membrane's surface.What effect will insulin have on cell function? Choose all that apply.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

GABA receptors play an essential role in neurotransmission in the central nervous system.In response to the appropriate signal,these receptors open up and allow Cl^- to flow into the cell.Given this information,GABA receptors can be classified as a

Correct Answer
verified

During neuronal signaling,a change in membrane potential will cause sodium channels to open and let Na⁺ ions diffuse down their concentration gradient into the cell.Which of the following helps establish the concentration gradient necessary for this process to occur?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified