Question 1

Which of the following best explains why the overall chemical equation for cellular respiration, $$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O}$$, is represented with multiple arrows?

Accepted Answer

Because cellular respiration consists of multiple sequential chemical reactions.

Question 2

A patient is exposed to a chemical that inhibits the transport of oxygen from the lungs to the bloodstream. Which cellular process will be most directly affected?

Accepted Answer

Cellular respiration

Question 3

Which of the following statements about the formation of sodium chloride ($$\mathrm{NaCl}) is $$correct?

Accepted Answer

Na is oxidized and Cl is reduced.

Question 4

Which of the following is the correct order of the main stages of cellular respiration?

Accepted Answer

Glycolysis, citric acid cycle, oxidative phosphorylation

Question 5

A scientist discovers a new organism that can survive in both aerobic and anaerobic environments. When oxygen is absent, the organism produces lactic acid. Which molecule is reduced by NADH during this process?

Accepted Answer

Pyruvate

Question 6

Which stage of cellular respiration is the only one that is cyclic?

Accepted Answer

Citric acid cycle

Question 7

A drug causes the inner mitochondrial membrane to become permeable to $$\mathrm{H^+}. $$What is the most immediate effect on cellular respiration?

Accepted Answer

ATP production by oxidative phosphorylation decreases.

Question 8

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

The products of photosynthesis are the reactants of cellular respiration.

Question 9

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

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 10

Why do humans store most of their excess energy as fat rather than carbohydrates?

Accepted Answer

Fats are hydrophobic and do not require water for storage.

Question 11

Which of the following statements about glycolysis is TRUE?

Accepted Answer

Glycolysis is universal and does not require a membrane-bound organelle.

Question 12

Which of the following is a direct product of the citric acid cycle?

Accepted Answer

NADH

Question 13

A buildup of which molecule initiates the inhibition of an enzyme that functions early in glycolysis?

Accepted Answer

ATP

Question 14

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

Accepted Answer

It uses the energy of a proton gradient to drive the synthesis of ATP.

Question 15

Which of the following is a reason why glycolysis is considered to be an ancient metabolic pathway?

Accepted Answer

It is universal and does not occur within a membrane-bound organelle.

Question 16

If you opened a wine vat and exposed the yeast to atmospheric oxygen, what would most likely happen?

Accepted Answer

The yeast would switch to aerobic respiration.

Question 17

Which of the following is a correct match between a stage of cellular respiration and its location in the cell?

Accepted Answer

Oxidative phosphorylation – mitochondria

Question 18

Which molecule generates fewer molecules of ATP because it donates its electrons further along the electron transport chain?

Accepted Answer

FADH$$_2$$

Question 19

Which of the following is a real-life example of a redox reaction in cellular respiration?

Accepted Answer

The transfer of hydrogen atoms from glucose to oxygen.

Question 20

Before proteins can be used for energy in cellular respiration, they must first be broken down into which of the following?

Accepted Answer

Amino acids

Step-by-Step Guidance for Cellular Respiration and Fermentation (General Biology)

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