Q: What is the summary equation for cellular respiration, specifically for the degradation of glucose?

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \text{Energy (ATP + heat)}$$

Question 1

Which of the following best describes the difference between fermentation and cellular respiration?

Accepted Answer

Fermentation partially breaks down glucose without using the electron transport chain, while cellular respiration fully oxidizes glucose using the electron transport chain.

Question 2

What is the summary equation for cellular respiration, specifically for the degradation of glucose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + 	ext{Energy (ATP + heat)}$$

Question 3

During cellular respiration, which molecule acts as the primary electron carrier, accepting electrons during redox reactions?

Accepted Answer

NAD+

Question 4

Which of the following best defines oxidation in biological systems?

Accepted Answer

Loss of electrons

Question 5

In the context of cellular respiration, what is the role of the electron transport chain?

Accepted Answer

It transfers electrons from NADH and FADH2 to oxygen, creating a proton gradient used for ATP synthesis.

Question 6

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

Accepted Answer

Oxidative phosphorylation (chemiosmosis)

Question 7

Where in the eukaryotic cell does glycolysis occur?

Accepted Answer

Cytoplasm

Question 8

Which of the following equations represents substrate-level phosphorylation during glycolysis?

Accepted Answer

$$\mathrm{C{-}C{-}C} \sim P + \mathrm{ADP} \rightarrow \mathrm{C{-}C{-}C} + \mathrm{ATP}$$

Question 9

What is the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

2 ATP

Question 10

During the intermediate step of cellular respiration, what are the products when pyruvate is oxidized?

Accepted Answer

Acetyl CoA, CO2, and NADH

Question 11

Why is the citric acid cycle considered a cycle?

Accepted Answer

Because its final product is used as a reactant in the first step.

Question 12

Which of the following statements about glycolysis is correct?

Accepted Answer

Glycolysis occurs in the cytoplasm and produces pyruvate, ATP, and NADH.

Question 13

Which enzyme is responsible for feedback control of glycolysis in the cell?

Accepted Answer

Phosphofructokinase

Question 14

Which of the following best describes the fate of pyruvate in lactic acid fermentation?

Accepted Answer

Pyruvate is reduced to lactic acid.

Question 15

Which statement best explains why glycolysis is considered an ancient metabolic pathway?

Accepted Answer

It does not require oxygen and occurs in the cytoplasm, suggesting it evolved before oxygen was abundant.

Question 16

Which of the following is a correct description of a redox reaction?

Accepted Answer

The electron donor is oxidized and the electron acceptor is reduced.

Question 17

Which molecule is the final electron acceptor in aerobic cellular respiration?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 18

How does ATP synthase generate ATP during oxidative phosphorylation?

Accepted Answer

By using the energy from a proton gradient to rotate and catalyze the formation of ATP from ADP and $$\mathrm{P_i}.$$

Question 19

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

Accepted Answer

It involves the direct transfer of a phosphate group from a substrate to ADP to form ATP.

Question 20

Why is it not possible to state an exact number of ATP molecules generated by the oxidation of a molecule of glucose?

Accepted Answer

Because the efficiency of the electron transport chain and ATP synthase can vary, and some energy is lost as heat or used for other cellular processes.

Cellular Respiration and Fermentation: Chapter 9 Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards