$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Chemical Energy} + \text{Heat}$

Question 1

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

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Chemical Energy} + 	ext{Heat}$

Question 2

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

Accepted Answer

$2$

Question 3

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic cellular respiration?

Accepted Answer

$O_2$

Question 4

What is the main purpose of the Krebs Cycle (Citric Acid Cycle) in cellular respiration?

Accepted Answer

To generate high-energy electron carriers (NADH and FADH$_2$) for the electron transport chain

Question 5

Which process directly produces the most ATP during cellular respiration?

Accepted Answer

Oxidative Phosphorylation

Question 6

If 3 molecules of glucose enter glycolysis, how many NADH molecules are produced during glycolysis?

Accepted Answer

$6$

Question 7

Which statement best explains why cellular respiration is considered a catabolic process?

Accepted Answer

It breaks down organic molecules to release energy

Question 8

What is the role of NAD$^+$ in cellular respiration?

Accepted Answer

It serves as an electron carrier, accepting electrons and hydrogen to become NADH

Question 9

During oxidative phosphorylation, how many ATP molecules are typically generated per NADH molecule?

Accepted Answer

$3$

Question 10

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

Use of a hydrogen ion gradient to drive ATP synthesis via ATP synthase

Question 11

Which step of cellular respiration does NOT directly produce ATP?

Accepted Answer

Intermediate step (conversion of pyruvate to Acetyl Co-A)

Question 12

In muscle cells under anaerobic conditions, which process allows ATP production to continue?

Accepted Answer

Lactic acid fermentation

Question 13

Which of the following is a product of oxidative phosphorylation?

Accepted Answer

ATP

Question 14

What is the efficiency rating of cellular respiration in terms of energy conversion from glucose?

Accepted Answer

Approximately 34%

Question 15

Which of the following statements about oxidation-reduction (redox) reactions is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons

Question 16

Which structure in the mitochondria increases the surface area for ATP production?

Accepted Answer

Cristae

Question 17

If oxygen is not available, which part of cellular respiration is directly inhibited?

Accepted Answer

Electron transport chain

Question 18

Which of the following is true regarding substrate-level phosphorylation?

Accepted Answer

It directly transfers a phosphate group to ADP to form ATP

Question 19

During the Krebs Cycle, how many NADH molecules are produced per turn?

Accepted Answer

$3$

Question 20

Which of the following is NOT a product of the complete aerobic breakdown of one glucose molecule?

Accepted Answer

Oxygen

Cellular Respiration: Mechanisms and Key Concepts

Study Guide - Practice Questions