Question 1

Which of the following statements best describes the role of ATP in cellular respiration?

Accepted Answer

ATP is the molecule that directly powers most cellular work by transferring chemical energy.

Question 2

During cellular respiration, which molecule is oxidized and which is reduced in the overall reaction $$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 3

Which process in cellular respiration produces the greatest amount of ATP per molecule of glucose?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 4

What is the net gain of ATP molecules produced by substrate-level phosphorylation during glycolysis from one molecule of glucose?

Accepted Answer

$$2$$

Question 5

Which of the following best explains why redox reactions are important in cellular respiration?

Accepted Answer

They transfer electrons, releasing energy that is used to make ATP.

Question 6

In the electron transport chain, what is the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 7

Which of the following is a correct description of chemiosmosis?

Accepted Answer

The movement of $$H^+$$ ions down their concentration gradient through ATP synthase, driving the synthesis of ATP.

Question 8

Which statement best describes the difference between fermentation and anaerobic respiration?

Accepted Answer

Anaerobic respiration uses an electron transport chain with a final electron acceptor other than oxygen, while fermentation does not use an electron transport chain.

Question 9

A yeast cell is placed in an environment with no oxygen. Which metabolic pathway will it use to generate ATP, and what are the main products?

Accepted Answer

Alcohol fermentation; ethanol and $$CO_2$$

Question 10

Which of the following molecules is produced during the citric acid cycle and carries electrons to the electron transport chain?

Accepted Answer

NADH

Question 11

If a cell is unable to regenerate NAD$$^+$$, which process will be directly affected?

Accepted Answer

Glycolysis

Question 12

Which of the following is TRUE regarding the ATP yield from the complete aerobic respiration of one molecule of glucose?

Accepted Answer

The cell produces up to 32 molecules of ATP, with most energy lost as heat.

Question 13

Which metabolic pathway is shared by both fermentation and cellular respiration?

Accepted Answer

Glycolysis

Question 14

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which process will be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 15

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

Accepted Answer

Fats have more electrons associated with hydrogen, which can be transferred to NADH and FADH$$_2.$$

Question 16

Which of the following is a real-life example of lactic acid fermentation?

Accepted Answer

Production of cheese and yogurt by bacteria.

Question 17

Which of the following equations correctly represents the net reaction of glycolysis?

Accepted Answer

$$	ext{Glucose} + 2NAD^+ + 2ADP + 2P_i ightarrow 2	ext{Pyruvate} + 2NADH + 2ATP + 2H_2O + 2H^+$$

Question 18

Which of the following is a key regulatory mechanism for controlling cellular respiration?

Accepted Answer

Feedback inhibition of enzymes such as phosphofructokinase.

Question 19

A muscle cell is working hard and oxygen is limited. Which pathway will it use to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 20

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

Accepted Answer

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

Cellular Respiration and Fermentation: Energy Flow and Metabolic Pathways

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