Question 1

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

Accepted Answer

It is oxidized to form carbon dioxide.

Question 2

During the electron transport chain, what is the final electron acceptor?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which of the following equations correctly represents the reduction of NAD+ during cellular respiration?

Accepted Answer

$$NAD^+ + H^+ + 2e^- \rightarrow NADH$$

Question 4

Where in the cell does glycolysis occur?

Accepted Answer

Cytosol

Question 5

Which process directly produces the most ATP during aerobic cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 6

What is the main purpose of fermentation in cells under anaerobic conditions?

Accepted Answer

To regenerate $$NAD^+ so $$glycolysis can continue

Question 7

Which of the following is a correct statement about substrate-level phosphorylation?

Accepted Answer

It involves the direct transfer of a phosphate group to ADP from a substrate.

Question 8

A metabolic poison that specifically inhibits ATP synthase would directly result in which of the following?

Accepted Answer

An increase in the proton gradient across the inner mitochondrial membrane

Question 9

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

Accepted Answer

Fats have more hydrogen atoms, leading to more electrons for the electron transport chain.

Question 10

In aerobic prokaryotes, where is the electron transport chain located?

Accepted Answer

On the plasma (cell) membrane

Question 11

Which of the following is a distinguishing feature of anaerobic respiration compared to fermentation?

Accepted Answer

Anaerobic respiration uses an electron transport chain with a final electron acceptor other than oxygen.

Question 12

During the Krebs cycle, which of the following occurs for each acetyl CoA that enters the cycle?

Accepted Answer

2 $$CO_2$$, 3 NADH, 1 FADH$$_2$$, and 1 ATP are produced

Question 13

Which of the following best describes the role of oxygen in cellular respiration?

Accepted Answer

It acts as the final electron acceptor, forming water.

Question 14

If a cell is exposed to cyanide, which blocks the electron transport chain, what is the most immediate effect on ATP production?

Accepted Answer

ATP production by oxidative phosphorylation ceases.

Question 15

Which of the following statements about glycolysis is correct?

Accepted Answer

It produces a net gain of 2 ATP and 2 NADH per glucose molecule.

Question 16

Which of the following best explains why glycolysis is considered evidence for evolution?

Accepted Answer

It occurs in all three domains of life and does not require oxygen or mitochondria.

Question 17

A cheetah sprints after its prey, rapidly increasing ATP production in muscle cells. After catching its prey and stopping, which feedback mechanism is most likely to occur?

Accepted Answer

ATP will inhibit enzymes in glycolysis, slowing down ATP production.

Question 18

Which of the following is a correct comparison between lactic acid fermentation and alcohol fermentation?

Accepted Answer

Both regenerate $$NAD^+$$, but only alcohol fermentation releases $$CO_2.$$

Question 19

Which of the following best describes the effect of uncoupling proteins in the inner mitochondrial membrane?

Accepted Answer

They decrease ATP production by allowing protons to bypass ATP synthase, generating heat instead.

Question 20

Which of the following is a true statement about facultative anaerobes?

Accepted Answer

They can switch between aerobic respiration and fermentation depending on oxygen availability.

Cellular Respiration & Fermentation: Study Notes for General Biology

Study Guide - Practice Questions

Study Guide - Flashcards