$$\text{Molarity} = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$$

Question 1

Which of the following best describes the role of ATP synthase in oxidative phosphorylation?

Accepted Answer

It synthesizes ATP by using the energy from the back-diffusion of protons across the inner mitochondrial membrane.

Question 2

During anaerobic glycolysis, what is the fate of pyruvate in human muscle cells?

Accepted Answer

It is reduced to lactic acid by lactate dehydrogenase.

Question 3

Which equation correctly represents the net ATP yield from one glucose molecule during anaerobic metabolism?

Accepted Answer

$$C_6H_{12}O_6$ + 2 ADP + 2 P_i \rightarrow 2 C_3H_6O_3 + 2 ATP + 2 H_2O$$

Question 4

Which process is responsible for the majority of ATP production during aerobic metabolism?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 5

A patient is experiencing muscle fatigue after intense exercise. Which molecule is most likely depleted, leading to reduced rapid ATP regeneration?

Accepted Answer

Creatine phosphate

Question 6

Which of the following best explains the concept of excess postexercise oxygen consumption (EPOC)?

Accepted Answer

It is the difference between theoretical oxygen demand and actual oxygen uptake at the end of exercise.

Question 7

Which statement about osmolarity and tonicity is correct?

Accepted Answer

Tonicity depends on the concentration of nonpenetrating solutes.

Question 8

A red blood cell is placed in a solution that is hyposmotic and hypotonic relative to its cytoplasm. What is the most likely outcome?

Accepted Answer

The cell will swell and may lyse due to water influx.

Question 9

Which equation correctly defines molarity?

Accepted Answer

$$	ext{Molarity} = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

Question 10

Which of the following is a nonpenetrating solute in the context of cell tonicity?

Accepted Answer

NaCl

Question 11

Which statement best describes the difference between osmolarity and osmolality?

Accepted Answer

Osmolarity is measured per liter of solution, while osmolality is per kilogram of solvent.

Question 12

Which of the following is true regarding the regulation of gene expression?

Accepted Answer

Regulated genes can be induced or repressed depending on cellular needs.

Question 13

Which process involves the synthesis of a protein chain from mRNA?

Accepted Answer

Translation

Question 14

Which molecule forms the core of the ribosome and is essential for its function?

Accepted Answer

rRNA

Question 15

A cell is exposed to a hypertonic solution. What will happen to the cell?

Accepted Answer

It will lose water and shrink.

Question 16

Which of the following is NOT a fluid compartment in the human body?

Accepted Answer

Bone matrix fluid

Question 17

Which equation represents the conversion of creatine phosphate and ADP to ATP in muscle cells?

Accepted Answer

$$	ext{Creatine phosphate} + ADP ightarrow 	ext{Creatine} + ATP$$

Question 18

Which of the following best describes the electrical disequilibrium across the cell membrane?

Accepted Answer

It is maintained by selective permeability and active transport of ions.

Question 19

Which step in cellular respiration directly produces the most NADH?

Accepted Answer

Citric acid cycle (Krebs cycle)

Cellular Metabolism, Genetic Information Flow, and Membrane Transport: Study Notes for Anatomy & Physiology

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