$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy}$$

Question 1

Which of the following best describes the overall chemical equation for cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy}$$

Question 2

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which process in cellular respiration produces the majority of ATP?

Accepted Answer

Oxidative Phosphorylation

Question 4

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

Accepted Answer

It is a coenzyme that carries electrons from food to the electron transport chain.

Question 5

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

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 6

In substrate-level phosphorylation, how is ATP generated?

Accepted Answer

By transferring a phosphate group directly from a substrate to ADP.

Question 7

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 8

If oxygen is not present, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 9

Which of the following best explains why glucose is considered a high-energy molecule?

Accepted Answer

It contains many electrons associated with hydrogen atoms.

Question 10

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

Accepted Answer

2 ATP

Question 11

Which enzyme is responsible for removing hydrogen atoms from glucose during cellular respiration?

Accepted Answer

Dehydrogenase

Question 12

What is the main purpose of the electron transport chain in mitochondria?

Accepted Answer

To create a proton gradient that drives ATP synthesis.

Question 13

Which of the following is true about oxidative phosphorylation?

Accepted Answer

It is powered by redox reactions.

Question 14

In alcoholic fermentation, what is the fate of pyruvate?

Accepted Answer

It is converted to ethanol and carbon dioxide.

Question 15

Which of the following best describes the function of ATP synthase?

Accepted Answer

It uses the proton gradient to synthesize ATP from ADP and Pi.

Question 16

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Citric Acid Cycle $$\rightarrow$$ Electron Transport Chain

Question 17

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+ so $$glycolysis can continue.

Question 18

A patient is experiencing muscle fatigue after intense exercise. Which process is most likely occurring in their muscle cells?

Accepted Answer

Lactic acid fermentation

Question 19

Which of the following is the correct formula for the ATP synthesis reaction catalyzed by ATP synthase?

Accepted Answer

$$ADP + Pi \rightarrow ATP$$

Question 20

Why do cells use enzymes during cellular respiration?

Accepted Answer

To lower the activation energy barrier and speed up reactions.

Cellular Respiration: Harvesting Chemical Energy (Chapter 9 Study Notes)

Study Guide - Practice Questions