Question 1

Which of the following best describes what happens to glucose and oxygen during cellular respiration?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 2

During glycolysis, what is the net gain of ATP molecules produced per molecule of glucose?

Accepted Answer

$$2$$

Question 3

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

O$$_2$$

Question 4

What is the main purpose of the citric acid cycle in cellular respiration?

Accepted Answer

To generate NADH and FADH$$_2$$ for the electron transport chain

Question 5

Which of the following statements about ATP synthase is correct?

Accepted Answer

It uses the flow of protons (H$$^+) $$down their gradient to catalyze the formation of ATP from ADP and P$$_i.$$

Question 6

Which of the following is a correct sequence of electron flow during aerobic cellular respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ ETC $$\rightarrow O$_2$$

Question 7

If a poison blocks the function of the mitochondrial ATP synthase, which of the following will occur?

Accepted Answer

ATP production by oxidative phosphorylation will decrease.

Question 8

Which process occurs in the cytosol of eukaryotic cells and does not require oxygen?

Accepted Answer

Glycolysis

Question 9

What is the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It serves as an electron carrier, becoming reduced to NADH.

Question 10

Which of the following best explains why fats produce more ATP per gram than carbohydrates?

Accepted Answer

Fats have more hydrogen atoms, providing more high-energy electrons for the electron transport chain.

Question 11

Which stage of cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 12

A patient’s muscle cells are deprived of oxygen. Which process will allow them to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 13

Which of the following is a product of alcohol fermentation?

Accepted Answer

Ethanol

Question 14

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

The molecule that is oxidized loses electrons.

Question 15

Which of the following best describes the energy investment and payoff phases of glycolysis?

Accepted Answer

ATP is consumed in the investment phase and produced in the payoff phase.

Question 16

Which of the following is true about facultative anaerobes?

Accepted Answer

They can survive using either fermentation or aerobic respiration.

Question 17

Which of the following is NOT a function of ATP in the cell?

Accepted Answer

Serving as a building block for DNA synthesis

Question 18

Which of the following best explains why glycolysis is considered one of the most ancient metabolic pathways?

Accepted Answer

It occurs in the cytosol and does not require membrane-bound organelles.

Question 19

Which of the following is a direct result of the electron transport chain activity in mitochondria?

Accepted Answer

Formation of a proton gradient across the inner mitochondrial membrane

Question 20

Which of the following statements about the ATP cycle is correct?

Accepted Answer

ATP is regenerated from ADP and P$$_i$$ using energy from catabolic reactions.

Cellular Respiration: Mechanisms and Bioenergetics

Study Guide - Practice Questions