Question 1

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

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + 38\ ATP$$

Question 2

Where does glycolysis occur within a eukaryotic cell?

Accepted Answer

Cytosol

Question 3

Which molecule is the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 4

What is the net gain of ATP molecules produced directly by glycolysis from one molecule of glucose?

Accepted Answer

2 ATP

Question 5

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

Accepted Answer

Oxidative phosphorylation

Question 6

During the conversion of pyruvate to acetyl CoA, which of the following occurs?

Accepted Answer

NADH is produced

Question 7

Which of the following best explains why fats yield more ATP per gram than carbohydrates?

Accepted Answer

Fats contain more carbon-hydrogen bonds, leading to more reduced coenzymes

Question 8

Which enzyme is a key regulatory point in glycolysis and is subject to allosteric regulation?

Accepted Answer

Phosphofructokinase

Question 9

If oxygen is not present, what is the fate of pyruvate in human muscle cells?

Accepted Answer

It is converted to lactate

Question 10

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It directly transfers a phosphate group to ADP from a phosphorylated substrate

Question 11

How many NADH molecules are produced from one glucose molecule during the Krebs cycle (including both turns for one glucose)?

Accepted Answer

6

Question 12

Which of the following best describes the role of the electron transport chain in cellular respiration?

Accepted Answer

It transfers electrons from NADH and FADH$$_2 to $$oxygen, pumping protons to create a gradient

Question 13

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 14

What is the main purpose of fermentation in the absence of oxygen?

Accepted Answer

To regenerate NAD$$^+ so $$glycolysis can continue

Question 15

Which of the following statements about the regulation of cellular respiration is correct?

Accepted Answer

AMP stimulates phosphofructokinase, increasing glycolysis

Question 16

Which of the following is NOT a direct product of the Krebs cycle?

Accepted Answer

Glucose

Question 17

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 18

Which of the following best explains why cyanide is a deadly poison?

Accepted Answer

It inhibits the electron transport chain, preventing ATP production

Question 19

Which of the following alternative energy sources can be converted into intermediates that enter the Krebs cycle?

Accepted Answer

Both fatty acids and amino acids

Question 20

If a cell is deprived of oxygen, which of the following processes will cease first?

Accepted Answer

Electron transport chain

Cellular Respiration and Metabolic Pathways: Study Guide

Study Guide - Practice Questions