Q: Which of the following equations correctly represents aerobic cellular respiration using glucose?

$$\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O} + \text{Energy}$$

Question 1

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

Accepted Answer

To break down organic molecules and generate ATP for cellular work

Question 2

Which of the following equations correctly represents aerobic cellular respiration using glucose?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2 ightarrow 6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} + 	ext{Energy}$$

Question 3

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation

Question 4

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

Accepted Answer

$$	ext{O}_2$$

Question 5

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

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a substrate, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 6

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 7

Where does glycolysis occur in a eukaryotic cell?

Accepted Answer

Cytosol

Question 8

Which of the following is a correct input and output pair for the citric acid cycle per glucose molecule?

Accepted Answer

Input: 2 pyruvate; Output: 2 ATP, 6 NADH, 2 FADH$$_2$$, 4 CO$$_2$$

Question 9

Which process is responsible for creating the proton gradient used to power ATP synthase?

Accepted Answer

Electron transport chain

Question 10

A poison that blocks the passage of electrons along the electron transport chain will result in which of the following?

Accepted Answer

Decreased proton gradient across the inner mitochondrial membrane

Question 11

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

Accepted Answer

Fats are more reduced and have more high-energy electrons to donate to the electron transport chain.

Question 12

Which of the following is true about fermentation?

Accepted Answer

Fermentation regenerates NAD$$^+ so $$glycolysis can continue in the absence of oxygen.

Question 13

In lactic acid fermentation, what is the fate of pyruvate?

Accepted Answer

It is converted directly to lactate

Question 14

Which of the following is a facultative anaerobe?

Accepted Answer

A yeast cell that can survive using either fermentation or cellular respiration

Question 15

Which of the following best describes the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons during redox reactions.

Question 16

Which of the following is a correct sequence of energy flow during cellular respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ electron transport chain $$\rightarrow$$ proton-motive force $$\rightarrow$$ ATP

Question 17

Which of the following is NOT a characteristic of living organisms?

Accepted Answer

Spontaneous generation

Question 18

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

Accepted Answer

It generates NADH and FADH$$_2$$ that feed electrons into the electron transport chain.

Question 19

Which of the following is the main regulatory mechanism for cellular respiration?

Accepted Answer

Feedback inhibition

Question 20

A patient is exposed to cyanide, which inhibits cytochrome c oxidase in the electron transport chain. What is the most immediate effect on cellular respiration?

Accepted Answer

Electron flow through the electron transport chain will stop, halting ATP production by oxidative phosphorylation.

Cellular Respiration: How Cells Harvest Chemical Energy

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