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

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

Question 1

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

Accepted Answer

To break down organic molecules and generate ATP, carbon dioxide, and water

Question 2

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 3

Which of the following statements about oxidative phosphorylation is correct?

Accepted Answer

It uses the energy from electrons transferred through the electron transport chain to synthesize ATP

Question 4

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following would most likely be observed in this patient’s cells?

Accepted Answer

Increased production of lactic acid due to reliance on fermentation

Question 5

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

Accepted Answer

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

Question 6

Which enzyme is responsible for transferring a phosphate group from ATP to glucose during the first step of glycolysis?

Accepted Answer

Hexokinase

Question 7

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

Accepted Answer

Fermentation

Question 8

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

Accepted Answer

Fats are more reduced and have more electrons available for transfer to NAD+ and FAD

Question 9

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

Accepted Answer

Oxygen acts as the final electron acceptor and is reduced to water

Question 10

A muscle cell is working hard during intense exercise and oxygen is limited. Which product will accumulate as a result of anaerobic respiration?

Accepted Answer

Lactic acid

Question 11

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group from a substrate to ADP to form ATP

Question 12

Which molecule is produced during the oxidation of pyruvate and enters the citric acid cycle?

Accepted Answer

Acetyl-CoA

Question 13

If a poison inhibits ATP synthase, which of the following would be directly affected?

Accepted Answer

The production of ATP from ADP and inorganic phosphate

Question 14

Which of the following is a correct statement about the citric acid cycle?

Accepted Answer

It produces NADH, FADH$$_2$$, ATP (or GTP), and releases CO$$_2$$

Question 15

Which of the following best explains why NADH and FADH$$_2$$ are important in cellular respiration?

Accepted Answer

They carry high-energy electrons to the electron transport chain

Question 16

A cell is exposed to cyanide, which blocks the transfer of electrons to oxygen in the electron transport chain. What is the most immediate effect on ATP production?

Accepted Answer

ATP production by oxidative phosphorylation stops

Question 17

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

Accepted Answer

Production of lactic acid in muscle cells during intense exercise

Question 18

Which of the following best describes the role of oxygen in aerobic cellular respiration?

Accepted Answer

It acts as the final electron acceptor in the electron transport chain

Question 19

Which of the following statements about the energy yield of aerobic versus anaerobic respiration is correct?

Accepted Answer

Aerobic respiration produces more ATP per glucose than anaerobic respiration

Question 20

Which of the following best explains why the electron transport chain is considered a series of redox reactions?

Accepted Answer

Electrons are transferred from one molecule to another, with each molecule being alternately oxidized and reduced

Chapter 9: Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard