Q: Which of the following best describes the function of the sodium-potassium pump in primary active transport?

It pumps 3 Na\textsuperscript{+} out of the cell and 2 K\textsuperscript{+} into the cell against their concentration gradients for each ATP hydrolyzed.

Q: Which equation best represents the energy required for moving a solute against its concentration gradient in active transport?

$$ \Delta G = RT \ln \left( \frac{[C]_\text{inside}}{[C]_\text{outside}} \right) $$

Q: Which of the following is a real-life example of secondary active transport in human physiology?

Na\textsuperscript{+}-glucose symporter in intestinal epithelial cells

Question 1

Which of the following best describes the function of the sodium-potassium pump in primary active transport?

Accepted Answer

It pumps 3 Na	extsuperscript{+} out of the cell and 2 K	extsuperscript{+} into the cell against their concentration gradients for each ATP hydrolyzed.

Question 2

Which equation best represents the energy required for moving a solute against its concentration gradient in active transport?

Accepted Answer

$$ \Delta G = RT \ln \left( \frac{[C]_	ext{inside}}{[C]_	ext{outside}} ight) $$

Question 3

A patient has a genetic defect in clathrin proteins. Which cellular process would be most directly affected?

Accepted Answer

Receptor-mediated endocytosis

Question 4

Which organelle is primarily responsible for the breakdown of hydrogen peroxide ($$ \mathrm{H_2O_2} ) $$into water in the cell?

Accepted Answer

Peroxisome

Question 5

Which of the following is a function of cell adhesion molecules (CAMs)?

Accepted Answer

Anchor cells to the extracellular matrix and assist in cell movement

Question 6

Which cytoskeletal element is primarily responsible for resisting pulling forces and is found in desmosomes?

Accepted Answer

Intermediate filaments

Question 7

A cell is observed to have a large number of mitochondria. What is the most likely reason for this?

Accepted Answer

The cell requires large amounts of ATP for energy-intensive processes.

Question 8

Which process is most directly responsible for the secretion of neurotransmitters from a neuron?

Accepted Answer

Exocytosis

Question 9

Which of the following statements about the resting membrane potential (RMP) is correct?

Accepted Answer

RMP is primarily determined by the concentration gradient of K	extsuperscript{+} across the membrane.

Question 10

Which of the following best describes the role of the Golgi apparatus?

Accepted Answer

It modifies, concentrates, and packages proteins and lipids received from the ER.

Question 11

A cell is exposed to a toxin that inhibits ATP production. Which transport process would be most immediately affected?

Accepted Answer

Primary active transport

Question 12

Which of the following is true regarding microvilli?

Accepted Answer

They are fingerlike projections that increase surface area for absorption.

Question 13

Which of the following organelles is directly involved in the synthesis of steroid hormones?

Accepted Answer

Smooth endoplasmic reticulum

Question 14

Which process involves the engulfment of solid particles by the cell, forming a phagosome?

Accepted Answer

Phagocytosis

Question 15

Which of the following best explains why receptor-mediated endocytosis is more selective than phagocytosis or pinocytosis?

Accepted Answer

It requires the binding of specific molecules to cell surface receptors before internalization.

Question 16

Which of the following is a correct match between organelle and function?

Accepted Answer

Peroxisome – detoxification of hydrogen peroxide

Question 17

Which of the following is a real-life example of secondary active transport in human physiology?

Accepted Answer

Na	extsuperscript{+}-glucose symporter in intestinal epithelial cells

Question 18

Which of the following best describes the structure and function of chromatin?

Accepted Answer

Chromatin consists of DNA wrapped around histone proteins, forming nucleosomes that regulate gene expression.

Question 19

Which equation best represents the Nernst potential for potassium ($$ K^+ ) $$across a cell membrane?

Accepted Answer

$$ E_{K^+} = \frac{RT}{zF} \ln \left( \frac{[K^+]_	ext{outside}}{[K^+]_	ext{inside}} ight) $$

Cellular Structure and Membrane Transport: Biochemistry and Physiology of the Cell

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