Question 1

Which of the following best describes the net products of glycolysis when starting with one molecule of glucose under aerobic conditions?

Accepted Answer

2 pyruvate, 2 NADH, and 2 net ATP

Question 2

What is the fate of pyruvate in a cell with insufficient oxygen supply?

Accepted Answer

It is converted to lactate by lactate dehydrogenase (LDH)

Question 3

How many ATP molecules are produced from one glucose molecule via anaerobic glycolysis?

Accepted Answer

2 ATP

Question 4

Which enzyme catalyzes the conversion of pyruvate to lactate during anaerobic metabolism?

Accepted Answer

Lactate dehydrogenase (LDH)

Question 5

In aerobic metabolism, what is the correct sequence of steps for ATP production from glucose?

Accepted Answer

Glycolysis → Conversion of pyruvate to acetyl-CoA → Citric acid cycle → Electron transport system

Question 6

Which of the following is the final electron acceptor in the electron transport system?

Accepted Answer

Oxygen ($$O_2)$$

Question 7

What are the end-products of a single acetyl-CoA running through the citric acid cycle?

Accepted Answer

3 NADH, 1 FADH2, 1 ATP, and 2 CO2

Question 8

Which of the following statements about glycolysis is TRUE?

Accepted Answer

Glycolysis occurs in the cytosol and does not require oxygen

Question 9

If glycolysis starts with glycogen instead of glucose, what is the net ATP yield?

Accepted Answer

3 ATP

Question 10

Which of the following is a role of NADH in the electron transport system?

Accepted Answer

Delivers high-energy electrons to the electron transport chain

Question 11

During aerobic metabolism, how many ATP are produced from one glucose molecule?

Accepted Answer

30-32 ATP

Question 12

Which metabolic pathway is the immediate source of ATP during intense, short-duration exercise?

Accepted Answer

ATP-PC system

Question 13

Which of the following conditions will favor the conversion of pyruvate to acetyl-CoA?

Accepted Answer

Sufficient oxygen and mitochondria

Question 14

What is the primary function of ATP synthase in the electron transport system?

Accepted Answer

Synthesizes ATP from ADP and inorganic phosphate

Question 15

Which of the following is TRUE regarding the breakdown products of lipids and proteins in metabolism?

Accepted Answer

Amino acids and fatty acids can be converted to acetyl-CoA and enter the citric acid cycle

Question 16

Which of the following is a key difference between aerobic and anaerobic glycolysis?

Accepted Answer

Anaerobic glycolysis produces lactate and only 2 net ATP

Question 17

In the electron transport system, what is the main consequence of the movement of electrons through protein complexes?

Accepted Answer

H+ ions are pumped into the intermembranous space, creating an electrochemical gradient

Question 18

Which of the following statements about the citric acid cycle is correct?

Accepted Answer

It produces NADH, FADH2, ATP, and CO2

Question 19

Which of the following is a real-life scenario where anaerobic metabolism predominates?

Accepted Answer

Sprinting during a 100-meter dash

Question 20

If a cell lacks sufficient mitochondria, what is the likely fate of pyruvate produced from glycolysis?

Accepted Answer

It is converted to lactate

Energy and Cellular Metabolism: Aerobic and Anaerobic Pathways

Study Guide - Practice Questions