Q: In the overall equation for aerobic cellular respiration, what is the correct balanced chemical formula?

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

Q: Which molecule is the reducing agent in the following reaction? $$\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O}$$

$$\text{C}_6\text{H}_{12}\text{O}_6$$

Question 1

Which of the following best describes the role of cellular respiration in the energy flow of an ecosystem?

Accepted Answer

It breaks down organic molecules to release energy for ATP synthesis.

Question 2

In the overall equation for aerobic cellular respiration, what is the correct balanced chemical formula?

Accepted Answer

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

Question 3

During redox reactions in cellular respiration, which molecule acts as the oxidizing agent when NAD+ is converted to NADH?

Accepted Answer

NAD+

Question 4

Which stage of cellular respiration occurs in the cytoplasm of eukaryotic cells?

Accepted Answer

Glycolysis

Question 5

Why is the breakdown of glucose during cellular respiration considered an exergonic reaction?

Accepted Answer

Because it releases energy, as indicated by $$\Delta G = -686 	ext{kcal/mol}$$

Question 6

Which of the following statements about glycolysis is TRUE?

Accepted Answer

It produces a net gain of 2 ATP and 2 NADH per glucose molecule.

Question 7

In the context of redox reactions, what happens to a molecule that is oxidized?

Accepted Answer

It loses electrons.

Question 8

Which process in cellular respiration is responsible for creating the majority of ATP?

Accepted Answer

Oxidative phosphorylation

Question 9

What is the main function of the electron transport chain in mitochondria?

Accepted Answer

To transfer electrons from NADH and FADH2 to oxygen, creating a proton gradient for ATP synthesis

Question 10

How does the structure of the mitochondrial inner membrane (cristae) contribute to ATP production?

Accepted Answer

It increases surface area for electron transport chains and ATP synthase, enhancing ATP production.

Question 11

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

Accepted Answer

The direct transfer of a phosphate group from a substrate to ADP to form ATP.

Question 12

During the citric acid cycle, how many NADH molecules are produced per turn?

Accepted Answer

3

Question 13

What is the role of oxygen in cellular respiration?

Accepted Answer

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

Question 14

Which of the following best explains why fermentation occurs in some cells?

Accepted Answer

Fermentation allows ATP production to continue when oxygen is not available.

Question 15

If a cell is deprived of oxygen, which process will be directly affected first?

Accepted Answer

Oxidative phosphorylation

Question 16

Which molecule is the reducing agent in the following reaction? $$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2 ightarrow 6 	ext{CO}_2 + 6 	ext{H}_2	ext{O}$$

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6$$

Question 17

Which of the following statements about the proton-motive force is correct?

Accepted Answer

It is the energy stored in a proton gradient across the mitochondrial inner membrane.

Question 18

A patient with a genetic defect in mitochondrial ATP synthase would most likely experience which of the following symptoms?

Accepted Answer

Reduced ability to produce ATP during oxidative phosphorylation.

Question 19

Which of the following is TRUE regarding the energy yield from one molecule of glucose during cellular respiration?

Accepted Answer

About 38 ATP molecules are produced, capturing roughly 40% of the energy in glucose.

Question 20

Which of the following best explains why the electron transport chain is organized into multiple steps?

Accepted Answer

To release energy in manageable amounts for ATP synthesis.

Cellular Respiration and Energy Flow in Biological Systems

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