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

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

Question 1

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

Accepted Answer

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

Question 2

Which stage of cellular respiration does NOT occur in the mitochondria?

Accepted Answer

Glycolysis

Question 3

What is the net yield of ATP, NADH, and pyruvate from one molecule of glucose during glycolysis?

Accepted Answer

2 ATP, 2 NADH, 2 pyruvate

Question 4

Why is oxygen essential for oxidative phosphorylation?

Accepted Answer

It is the final electron acceptor, pulling electrons down the chain due to its high electronegativity

Question 5

During which process is ATP produced by substrate-level phosphorylation?

Accepted Answer

Glycolysis and the citric acid cycle

Question 6

A person eats a meal high in carbohydrates, fats, and proteins. Which of the following is true regarding how these macromolecules are used in cellular respiration?

Accepted Answer

Fats and proteins can enter the pathway at different points, such as glycolysis and the citric acid cycle

Question 7

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+

Question 8

If a person walks at 3 mph and burns 245 kcal per hour, how long would it take to burn off a slice of pizza containing 475 kcal?

Accepted Answer

About 2 hours

Question 9

Which of the following is a characteristic of glycolysis that suggests it is an ancient metabolic pathway?

Accepted Answer

It occurs in the cytosol and does not require membrane-bound organelles

Question 10

What would happen to the electron transport chain if oxygen were absent?

Accepted Answer

The chain would stop, and NADH and FADH2 could not be oxidized, halting ATP synthesis

Question 11

Which of the following best explains why someone can gain weight and store fat even on a low-fat diet?

Accepted Answer

Excess calories from carbohydrates and proteins can be converted into fat via metabolic pathways

Question 12

Which molecule is reduced during the process of cellular respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 13

In the citric acid cycle, what is the fate of the two carbons that enter as acetyl CoA?

Accepted Answer

They are released as $$CO_2$$

Question 14

Which of the following is a direct product of the electron transport chain?

Accepted Answer

Water ($$H_2O)$$

Question 15

Brown fat cells generate heat instead of ATP because:

Accepted Answer

They have a 'short circuit' in their electron transport chain, allowing protons to flow back without generating ATP

Question 16

Which of the following best describes the role of NAD+ in cellular respiration?

Accepted Answer

It shuttles electrons from fuel molecules to the electron transport chain

Question 17

A patient has a genetic defect that prevents the formation of FADH2. Which stage of cellular respiration would be most directly affected?

Accepted Answer

Citric acid cycle

Question 18

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

Accepted Answer

4 pyruvate

Question 19

Which process is responsible for the majority of ATP production in cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 20

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

How Cells Harvest Chemical Energy: Cellular Respiration and Fermentation

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