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 an anabolic pathway?

Accepted Answer

Assembly of proteins from amino acids

Question 3

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

Accepted Answer

They assist enzymes by transferring electrons and hydrogen ions during metabolic reactions.

Question 4

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$$2$$

Question 5

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups.

Question 6

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 used in fermentation pathways.

Question 7

Which of the following best summarizes the preparatory step in cellular respiration?

Accepted Answer

Pyruvate is converted into a 2-carbon acetyl group, carbon dioxide, and NADH.

Question 8

Which molecule acts as the immediate energy currency for most cellular activities?

Accepted Answer

ATP

Question 9

How many NADH molecules are produced during glycolysis from one molecule of glucose?

Accepted Answer

$$2$$

Question 10

Which of the following is a waste product of the preparatory step in cellular respiration?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 11

What is the main function of coenzyme A in the preparatory step of cellular respiration?

Accepted Answer

To pick up and transport the acetyl group, forming acetyl CoA

Question 12

Which step of cellular respiration occurs in the cytoplasm?

Accepted Answer

Glycolysis

Question 13

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

Accepted Answer

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

Question 14

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

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

Question 15

Which of the following is NOT a product of glycolysis?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 16

A patient is unable to produce NAD+. Which stage of cellular respiration would be directly affected first?

Accepted Answer

Glycolysis

Question 17

Which of the following statements about enzymes in metabolism is correct?

Accepted Answer

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

Question 18

Which of the following best explains why cells can use proteins and fats as energy sources when glucose is unavailable?

Accepted Answer

Proteins and fats can be converted into intermediates that enter metabolic pathways like glycolysis or the citric acid cycle.

Question 19

Which of the following is the correct sequence of the first two steps of cellular respiration?

Accepted Answer

Glycolysis, Preparatory step

Question 20

In the preparatory step, what happens to the carbon atoms from pyruvate?

Accepted Answer

One is released as $$CO_2$$, and two form the acetyl group.

Metabolic Pathways and Cellular Respiration: Glycolysis and the Preparatory Step

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