Q: Which equation correctly represents the hydrolysis of ATP in the cell?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Question 1

Which of the following best describes the difference between catabolic and anabolic reactions in cellular metabolism?

Accepted Answer

Catabolic reactions break down molecules and release energy, while anabolic reactions build molecules and require energy.

Question 2

Which equation correctly represents the hydrolysis of ATP in the cell?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 3

A muscle cell is rapidly contracting during a sprint and begins to run low on oxygen. Which metabolic pathway will the cell primarily use to generate ATP, and what byproduct will accumulate?

Accepted Answer

Lactic acid fermentation; lactate

Question 4

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes lower the activation energy, speeding up reactions without being consumed.

Question 5

Which of the following best explains why oxygen is essential for aerobic cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, allowing ATP production.

Question 6

Which process is responsible for the majority of ATP generated during cellular respiration?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 7

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site and blocking substrate binding.

Question 8

Which of the following is a correct summary of the first law of thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 9

During the electron transport chain, what is the main role of the proton (H⁺) gradient across the inner mitochondrial membrane?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 10

Which of the following best describes the relationship between NAD⁺ and NADH in cellular respiration?

Accepted Answer

NAD⁺ is the oxidized form that accepts electrons, becoming NADH, which then donates electrons to the electron transport chain.

Question 11

Which of the following equations correctly represents aerobic cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 ightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 12

Which of the following is a real-life example of an enzyme cofactor?

Accepted Answer

Zinc (Zn) as a cofactor for some enzymes

Question 13

Which of the following best explains why bread rises during baking?

Accepted Answer

Yeast produces carbon dioxide during alcohol fermentation, which makes the dough rise.

Question 14

Which of the following is NOT a function performed by ATP in the cell?

Accepted Answer

Serving as a building block for DNA synthesis

Question 15

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

The diffusion of protons (H⁺) across the inner mitochondrial membrane through ATP synthase, generating ATP

Question 16

A patient is exposed to a toxin that blocks ATP synthase. Which of the following would be the most immediate effect on cellular respiration?

Accepted Answer

ATP production via oxidative phosphorylation would decrease sharply.

Question 17

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is generated directly by transferring a phosphate group from a substrate to ADP.

Question 18

Which of the following best explains why living organisms are considered 'islands of low entropy'?

Accepted Answer

They maintain a high degree of order and organization despite the universal tendency toward disorder.

Question 19

Which of the following is a key difference between obligate anaerobes and facultative anaerobes?

Accepted Answer

Obligate anaerobes cannot survive in the presence of oxygen, while facultative anaerobes can live with or without oxygen.

Chapter 8: An Introduction to Metabolism

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