Q: A sodium-potassium ATPase pump moves sodium and potassium ions across the plasma membrane. Which equation best represents the stoichiometry of this pump?

$$3 \mathrm{Na}^+ \text{ out}, 2 \mathrm{K}^+ \text{ in}$$

Q: Which of the following transport mechanisms is most likely to be inhibited by a drug that blocks ATP synthesis?

Na\textsuperscript{+}/K\textsuperscript{+} ATPase activity

Q: Which equation best represents the Gibbs free energy change ($$\Delta G) $$for the movement of an ion across a membrane?

$$\Delta G = RT \ln \left( \frac{[C]_\text{in}}{[C]_\text{out}} \right) + zF\Delta \Psi$$

Question 1

Which of the following best describes primary active transport across a biological membrane?

Accepted Answer

It directly uses ATP hydrolysis to move molecules against their concentration gradient.

Question 2

A sodium-potassium ATPase pump moves sodium and potassium ions across the plasma membrane. Which equation best represents the stoichiometry of this pump?

Accepted Answer

$$3 \mathrm{Na}^+ 	ext{ out}, 2 \mathrm{K}^+ 	ext{ in}$$

Question 3

Which of the following is an example of facilitated diffusion?

Accepted Answer

Glucose uptake by GLUT1 transporter in erythrocytes

Question 4

Which statement about secondary active transport is correct?

Accepted Answer

It uses the energy from the movement of one molecule down its gradient to move another molecule against its gradient.

Question 5

A symporter is best described as:

Accepted Answer

A transporter that moves two molecules in the same direction across the membrane.

Question 6

Which process is responsible for the uptake of large particles, such as bacteria, by immune cells?

Accepted Answer

Phagocytosis

Question 7

Which of the following transport mechanisms is most likely to be inhibited by a drug that blocks ATP synthesis?

Accepted Answer

Na	extsuperscript{+}/K	extsuperscript{+} ATPase activity

Question 8

Which of the following best describes the difference between uniporters and antiporters?

Accepted Answer

Uniporters move one molecule at a time; antiporters move two molecules in opposite directions.

Question 9

Which equation best represents the Gibbs free energy change ($$\Delta G) $$for the movement of an ion across a membrane?

Accepted Answer

$$\Delta G = RT \ln \left( \frac{[C]_	ext{in}}{[C]_	ext{out}} ight) + zF\Delta \Psi$$

Question 10

A patient with a genetic defect in the CFTR chloride channel would most likely experience which of the following?

Accepted Answer

Abnormal water and chloride transport in epithelial tissues

Question 11

Which of the following is NOT a characteristic of passive transport?

Accepted Answer

It moves molecules against their concentration gradient.

Question 12

Which of the following scenarios best illustrates secondary active transport?

Accepted Answer

The SGLT1 transporter using the sodium gradient to import glucose into intestinal cells.

Question 13

Which of the following best explains why facilitated diffusion exhibits saturation kinetics?

Accepted Answer

Carrier proteins become saturated at high substrate concentrations.

Question 14

Which of the following is a real-life example of an antiporter?

Accepted Answer

Na	extsuperscript{+}/Ca	extsuperscript{2+} exchanger in cardiac muscle

Question 15

Which of the following processes is most directly responsible for the acidification of lysosomes?

Accepted Answer

V-type ATPase actively transporting protons into the lysosome

Membrane Transport: Mechanisms and Classification

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