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

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

Question 1

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

Accepted Answer

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

Question 2

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation (via the electron transport chain and chemiosmosis)

Question 3

What is the role of NAD+ in cellular respiration?

Accepted Answer

It functions as an electron carrier, accepting electrons during redox reactions.

Question 4

Which process occurs in the cytosol and can proceed with or without oxygen?

Accepted Answer

Glycolysis

Question 5

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

Accepted Answer

Oxygen ($$O_2)$$

Question 6

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD+ so glycolysis can continue.

Question 7

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

Accepted Answer

2

Question 8

Which of the following is a product of the Citric Acid Cycle for each turn?

Accepted Answer

3 NADH

Question 9

What is the main purpose of the electron transport chain in cellular respiration?

Accepted Answer

To generate a proton gradient for ATP synthesis

Question 10

Which enzyme catalyzes the conversion of phosphoenolpyruvate to pyruvate in glycolysis?

Accepted Answer

Pyruvate kinase

Question 11

In lactic acid fermentation, what is the fate of pyruvate?

Accepted Answer

It is reduced to lactate.

Question 12

Which of the following best explains why cellular respiration is considered more efficient than fermentation?

Accepted Answer

Cellular respiration uses oxygen as the final electron acceptor, allowing for complete oxidation of glucose.

Question 13

Which molecule is regenerated at the end of the Citric Acid Cycle, allowing the cycle to continue?

Accepted Answer

Oxaloacetate

Question 14

What is the main function of ATP synthase in cellular respiration?

Accepted Answer

To synthesize ATP from ADP and inorganic phosphate using the proton gradient

Question 15

Which of the following is TRUE about substrate-level phosphorylation?

Accepted Answer

It directly transfers a phosphate group to ADP from a substrate molecule.

Question 16

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is most likely responsible for the production of ATP under these anaerobic conditions?

Accepted Answer

Lactic acid fermentation

Question 17

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

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 18

If a cell is deprived of oxygen, which process will be directly inhibited?

Accepted Answer

Electron transport chain

Question 19

Which of the following is a key difference between alcohol fermentation and lactic acid fermentation?

Accepted Answer

Alcohol fermentation releases $$CO_2$$, while lactic acid fermentation does not.

Question 20

Which of the following best describes chemiosmosis in cellular respiration?

Accepted Answer

The synthesis of ATP driven by the flow of protons down their concentration gradient through ATP synthase

Cellular Respiration: Energy Harvesting in Cells

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