$$\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O} + \text{Energy}$$

Question 1

Which of the following best describes the primary function of the mitochondrion in eukaryotic cells?

Accepted Answer

Production of ATP through oxidative phosphorylation

Question 2

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

Accepted Answer

O$$_2$$

Question 3

Which of the following equations correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2 ightarrow 6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} + 	ext{Energy}$$

Question 4

Which process occurs in the cytoplasm and does NOT require oxygen?

Accepted Answer

Glycolysis

Question 5

What is the main purpose of fermentation in anaerobic conditions?

Accepted Answer

To regenerate NAD$$^+ so $$glycolysis can continue

Question 6

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

Accepted Answer

Glucose is oxidized to carbon dioxide

Question 7

In the citric acid (Krebs) cycle, what is the fate of the carbons originally present in glucose?

Accepted Answer

They are released as CO$$_2$$

Question 8

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

Accepted Answer

Fats are broken down into acetyl-CoA, which enters the citric acid cycle and produces more NADH and FADH$$_2$$

Question 9

Which of the following is a direct product of substrate-level phosphorylation?

Accepted Answer

ATP

Question 10

A muscle cell is working hard and oxygen becomes limited. Which process will allow the cell to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 11

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

The synthesis of ATP using the energy of a proton gradient across the inner mitochondrial membrane

Question 12

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

Accepted Answer

4 FADH$$_2$$

Question 13

Why is oxygen required for the complete oxidation of glucose in aerobic respiration?

Accepted Answer

It is the final electron acceptor in the electron transport chain

Question 14

Which of the following best explains why lactic acid fermentation is preferable to alcoholic fermentation in human muscle cells?

Accepted Answer

Lactic acid fermentation does not produce toxic ethanol

Question 15

Which step in cellular respiration produces the most ATP per glucose molecule?

Accepted Answer

Oxidative phosphorylation

Question 16

If a poison blocks the function of ATP synthase, which process will be directly inhibited?

Accepted Answer

Chemiosmosis

Question 17

Which of the following is a waste product of aerobic cellular respiration that is exhaled by animals?

Accepted Answer

CO$$_2$$

Question 18

Which of the following statements about the relationship between photosynthesis and cellular respiration is correct?

Accepted Answer

The products of photosynthesis are the reactants of cellular respiration

Question 19

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They carry electrons to the electron transport chain

Question 20

A bacterium living in a deep-sea vent uses sulfur instead of oxygen as the final electron acceptor. Which type of respiration is this?

Accepted Answer

Anaerobic respiration

Cellular Respiration: Pathways, Mechanisms, and Energy Yield

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