Q: Which of the following is the correct overall equation for cellular respiration?

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

Question 1

Which of the following best describes the difference between catabolism and anabolism in microbial metabolism?

Accepted Answer

Catabolism involves the breakdown of complex molecules to release energy, while anabolism uses energy to build complex molecules from simpler ones.

Question 2

Adenosine triphosphate (ATP) is generated from adenosine diphosphate (ADP) by which of the following processes?

Accepted Answer

Addition of a phosphate group to ADP, a process known as phosphorylation.

Question 3

During a redox reaction in cellular metabolism, what happens to the molecule that is oxidized?

Accepted Answer

It loses electrons.

Question 4

Why is NAD+ considered to be oxidized and NADH considered to be reduced?

Accepted Answer

NAD+ has lost electrons, while NADH has gained electrons.

Question 5

Which of the following statements best explains the role of NADH in cellular respiration?

Accepted Answer

NADH acts as an energy carrier by storing high-energy electrons that are later used in the electron transport chain.

Question 6

Which of the following correctly distinguishes between respiration and fermentation in microorganisms?

Accepted Answer

Respiration uses an electron transport chain and a terminal electron acceptor, while fermentation does not use an electron transport chain.

Question 7

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

Accepted Answer

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

Question 8

Which of the following best describes substrate-level phosphorylation during glycolysis?

Accepted Answer

A phosphate group is directly transferred from a phosphorylated substrate to ADP to form ATP.

Question 9

After glycolysis, where do the NADH molecules produced go in a cell undergoing aerobic respiration?

Accepted Answer

They are transported to the electron transport chain for further oxidation.

Question 10

Which of the following is the correct overall equation for cellular respiration?

Accepted Answer

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

Question 11

During the citric acid cycle, for each molecule of acetyl CoA that enters, how many molecules of CO$$_2$$ are released?

Accepted Answer

$$2$$

Question 12

What is the main function of the electron transport chain in cellular respiration?

Accepted Answer

To transfer electrons from NADH and FADH$$_2 to $$oxygen, generating a proton gradient across the membrane.

Question 13

Why is oxygen (O$$_2) $$considered the terminal electron acceptor in aerobic respiration?

Accepted Answer

It accepts electrons at the end of the electron transport chain, forming water.

Question 14

How does ATP synthase generate ATP from ADP and inorganic phosphate?

Accepted Answer

By using the energy from the flow of protons (H$$^+) $$down their gradient to catalyze the reaction $$ADP + P_i \rightarrow ATP$$

Question 15

Which of the following best describes chemiosmosis in the context of cellular respiration?

Accepted Answer

The movement of protons across a membrane, generating a proton gradient that drives ATP synthesis.

Question 16

Why is maintaining a proton (H$$^+) $$gradient across the mitochondrial membrane essential for ATP production?

Accepted Answer

The gradient provides the energy required for ATP synthase to convert ADP and inorganic phosphate into ATP.

Question 17

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows cells to regenerate NAD+ from NADH in the absence of an electron transport chain.

Question 18

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate (lactic acid)

Question 19

A yeast cell is placed in an anaerobic environment with abundant glucose. Which metabolic pathway will it primarily use to generate ATP, and what is a major byproduct?

Accepted Answer

Alcohol fermentation; ethanol

Question 20

Which of the following best explains why the total amount of ATP produced by cellular respiration is variable?

Accepted Answer

The efficiency of the electron transport chain and the use of NADH and FADH$$_2$$ can vary depending on the cell type and conditions.

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