$$C_6H_{12}O_6$ + 6 O_2$ \rightarrow 6 CO_2$ + 6 H_2O + \text{energy}$$

$$CO_2$$, NADH, $$FADH_2$$, \text{and ATP}$

Question 1

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

Accepted Answer

$$C_6H_{12}O_6$ + 6 O_2$ ightarrow 6 CO_2$ + 6 H_2O + 	ext{energy}$$

Question 2

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

Accepted Answer

$$2$$

Question 3

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

Accepted Answer

$$O_2$$

Question 4

What is the primary purpose of the electron transport chain in mitochondria?

Accepted Answer

To pump protons across the inner mitochondrial membrane

Question 5

Which process in cellular respiration produces the most ATP per glucose molecule?

Accepted Answer

Oxidative phosphorylation

Question 6

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

Accepted Answer

It accepts electrons during redox reactions

Question 7

Which of the following statements about ATP hydrolysis is correct?

Accepted Answer

Energy released from ATP hydrolysis is used to phosphorylate proteins

Question 8

During the citric acid cycle, acetyl CoA is oxidized to produce which of the following products?

Accepted Answer

$$CO_2$$, NADH, $$FADH_2$$, 	ext{and ATP}$

Question 9

Which enzyme is regulated by ATP through allosteric inhibition during glycolysis?

Accepted Answer

Phosphofructokinase

Question 10

What is the main difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group from a substrate to ADP

Question 11

In the absence of oxygen, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 12

Which of the following is a product of lactic acid fermentation in muscle cells?

Accepted Answer

$$Lactate$$

Question 13

Why is oxygen considered the most effective electron acceptor in cellular respiration?

Accepted Answer

It allows for the generation of a large proton-motive force

Question 14

Which of the following pathways is NOT directly dependent on oxygen?

Accepted Answer

Glycolysis

Question 15

What is the main function of the enzyme ATP synthase?

Accepted Answer

To synthesize ATP from ADP and Pi using a proton gradient

Question 16

Which of the following is TRUE about fermentation compared to cellular respiration?

Accepted Answer

Fermentation is less efficient and produces less ATP per glucose

Question 17

During pyruvate processing, what is the fate of the carbon atoms from pyruvate?

Accepted Answer

One carbon is released as $$CO_2$$, and the remaining two form acetyl CoA

Question 18

Which of the following is a key regulatory mechanism in cellular respiration?

Accepted Answer

Feedback inhibition by ATP and NADH

Question 19

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

Accepted Answer

It directly uses oxygen as a reactant

Question 20

Which of the following is a real-world application of fermentation?

Accepted Answer

Production of tofu and yogurt

Cellular Respiration and Fermentation: Energy Harvesting in Cells

Study Guide - Practice Questions