Q: Which equation correctly represents the overall process of aerobic cellular respiration?

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (ATP + heat)}$

Question 1

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

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, forming water.

Question 2

During glycolysis, how many net ATP molecules are produced per molecule of glucose?

Accepted Answer

$2$

Question 3

Which equation correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy (ATP + heat)}$

Question 4

What is the main function of NAD+ in cellular respiration?

Accepted Answer

NAD+ serves as an oxidizing agent, accepting electrons during redox reactions.

Question 5

Which process produces the majority of ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 6

In the absence of oxygen, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 7

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 8

What is the role of the electron transport chain in mitochondria?

Accepted Answer

It transfers electrons from NADH and FADH2 to oxygen, releasing energy to pump protons.

Question 9

Which of the following is a correct description of chemiosmosis?

Accepted Answer

Chemiosmosis is the process by which energy from a proton gradient is used to synthesize ATP.

Question 10

Which of the following is NOT a product of the citric acid cycle per turn?

Accepted Answer

$2$ ATP

Question 11

A patient is diagnosed with a genetic defect that prevents the formation of acetyl CoA from pyruvate. Which metabolic process will be directly impaired?

Accepted Answer

Citric acid cycle

Question 12

Which of the following statements about substrate-level phosphorylation is true?

Accepted Answer

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

Question 13

Which type of fermentation is responsible for the production of yogurt and cheese?

Accepted Answer

Lactic acid fermentation

Question 14

What is the main difference between fermentation and anaerobic respiration?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor, while anaerobic respiration uses an electron transport chain with a non-oxygen final electron acceptor.

Question 15

Which of the following molecules can be used as fuel for cellular respiration?

Accepted Answer

Carbohydrates, fats, and proteins

Question 16

Why does the oxidation of a gram of fat produce more than twice as much ATP as the oxidation of a gram of carbohydrate?

Accepted Answer

Fats have more high-energy electrons due to their abundance of hydrogen.

Question 17

Which feedback mechanism regulates cellular respiration to prevent wasteful ATP production?

Accepted Answer

Feedback inhibition

Question 18

A facultative anaerobe is an organism that:

Accepted Answer

Can survive using either fermentation or aerobic respiration.

Question 19

Which of the following best explains why glycolysis is considered one of the most widespread metabolic pathways on Earth?

Accepted Answer

It occurs in the cytoplasm and does not require membrane-bound organelles or oxygen.

Question 20

During lactic acid fermentation, which molecule is reduced and which is oxidized?

Accepted Answer

Pyruvate is reduced and NADH is oxidized.

Cellular Respiration and Fermentation: Catabolic Pathways for Energy Production

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