Q: Which of the following equations correctly represents the breakdown of ATP?

$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{Pi} + \text{energy}$$

Question 1

Which of the following best describes the difference between linear and cyclic metabolic pathways?

Accepted Answer

In linear pathways, the product of one reaction becomes the substrate for the next, while in cyclic pathways, the substrate enters and the cycle repeats with the same basic chemicals.

Question 2

Which of the following is an example of a catabolic pathway?

Accepted Answer

Breakdown of glucose into water, carbon dioxide, and energy

Question 3

What is the net gain of ATP molecules during glycolysis from one molecule of glucose?

Accepted Answer

$$2$$

Question 4

During glycolysis, what is the fate of the hydrogen ions and electrons released from G3P?

Accepted Answer

They are picked up by NAD$$^+ to $$form NADH.

Question 5

Which coenzyme is directly involved in the preparatory step of cellular respiration, as shown in the provided diagram?

Accepted Answer

NAD$$^+$$

Question 6

What is the primary role of coenzymes such as NAD$$^+$$ and FAD in cellular respiration?

Accepted Answer

They transport hydrogen ions and electrons during metabolic reactions.

Question 7

Which of the following statements about ATP is correct?

Accepted Answer

Energy is released when the bond between the second and third phosphate groups is broken.

Question 8

If oxygen is not present in a cell, what happens to the pyruvate produced during glycolysis?

Accepted Answer

It cannot enter the mitochondria and is instead converted to lactate or ethanol.

Question 9

Which step of cellular respiration occurs in the cytoplasm?

Accepted Answer

Glycolysis

Question 10

How many NADH molecules are produced during the preparatory step from one glucose molecule?

Accepted Answer

$$2$$

Question 11

Which of the following best explains why cells prefer glucose as their primary energy source?

Accepted Answer

Glucose is readily available from food and can be quickly metabolized to produce ATP.

Question 12

Which of the following is NOT a product of the preparatory step in cellular respiration?

Accepted Answer

ATP

Question 13

What is the correct sequence of steps in cellular respiration for the complete oxidation of glucose?

Accepted Answer

Glycolysis → Preparatory step → Citric acid cycle → Electron transport system

Question 14

Which of the following equations correctly represents the breakdown of ATP?

Accepted Answer

$$\mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{Pi} + 	ext{energy}$$

Question 15

A patient is found to have a deficiency in NAD$$^+. $$Which stage of cellular respiration would be most directly affected?

Accepted Answer

Glycolysis

Question 16

Which of the following statements about enzymes in metabolic pathways is TRUE?

Accepted Answer

Enzymes are specific to the reactions they catalyze and can be reused.

Question 17

During the energy investment phase of glycolysis, what happens to the glucose molecule?

Accepted Answer

It is phosphorylated by two ATP molecules and split into two G3P molecules.

Question 18

Which of the following best describes the role of Coenzyme A in the preparatory step?

Accepted Answer

It picks up an acetyl group to form acetyl CoA.

Question 19

If a cell is unable to produce enough ATP, which of the following processes is most likely impaired?

Accepted Answer

Both protein synthesis and active transport

Question 20

Which of the following statements about the fate of pyruvate in aerobic versus anaerobic conditions is correct?

Accepted Answer

In aerobic conditions, pyruvate is converted to acetyl CoA and enters the citric acid cycle.

Metabolic Pathways and Cellular Respiration: Energy Production in Human Cells

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