Q: Which of the following equations correctly represents the overall process of aerobic cellular respiration?

$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{Energy}$

Question 1

Which of the following best describes the main purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To break down organic molecules and generate ATP for cellular work

Question 2

During aerobic cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

O$_2$

Question 3

Which of the following equations correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{Energy}$

Question 4

Which process produces the greatest amount of ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 5

In the absence of oxygen, which pathway can a human muscle cell use to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 6

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Glucose is oxidized and oxygen is reduced

Question 7

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

Accepted Answer

2 ATP

Question 8

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

Accepted Answer

Fats have more hydrogen atoms, providing more electrons for the electron transport chain

Question 9

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

Accepted Answer

ATP is produced directly by the transfer of a phosphate group from a substrate to ADP

Question 10

A poison that blocks the function of ATP synthase would directly inhibit which process?

Accepted Answer

The synthesis of ATP from ADP and Pi during chemiosmosis

Question 11

Which of the following is true about the electron transport chain (ETC) in mitochondria?

Accepted Answer

It pumps protons into the intermembrane space, creating a gradient used for ATP synthesis

Question 12

Which of the following best describes the role of NAD+ in cellular respiration?

Accepted Answer

It acts as an oxidizing agent, accepting electrons during redox reactions

Question 13

Which of the following is a key difference between fermentation and anaerobic respiration?

Accepted Answer

Anaerobic respiration uses an electron transport chain with a final electron acceptor other than O$_2$, while fermentation does not use an electron transport chain

Question 14

Which of the following statements about glycolysis is correct?

Accepted Answer

It occurs in the cytoplasm and produces pyruvate, ATP, and NADH

Question 15

A facultative anaerobe is an organism that:

Accepted Answer

Can use either fermentation or aerobic respiration depending on oxygen availability

Question 16

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

Accepted Answer

Lactate

Question 17

Which step in cellular respiration produces the most NADH per glucose molecule?

Accepted Answer

Citric acid cycle

Question 18

Why is glycolysis considered one of the most ancient metabolic pathways?

Accepted Answer

It occurs in the cytosol and does not require oxygen

Question 19

Which of the following best explains why the energy yield from fermentation is much lower than from aerobic respiration?

Accepted Answer

Fermentation does not fully oxidize glucose, so less energy is extracted

Question 20

Which of the following metabolic intermediates is produced during both glycolysis and the breakdown of fats?

Accepted Answer

Acetyl CoA

Cellular Respiration and Fermentation: Mechanisms and Pathways

Study Guide - Practice Questions

Study Guide - Flashcards