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

Question 1

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP serves as the primary energy carrier, transferring energy from catabolic to anabolic reactions.

Question 2

During cellular respiration, which of the following equations correctly represents the overall process?

Accepted Answer

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

Question 3

Which of the following statements about the flow of energy and matter in an ecosystem is correct?

Accepted Answer

Energy flows through the ecosystem and is eventually lost as heat, while elements are recycled.

Question 4

Which component of ATP is directly responsible for its ability to store and release energy?

Accepted Answer

The triphosphate group

Question 5

In the process of cellular respiration, what is the primary function of the electron transport chain?

Accepted Answer

To transfer electrons from NADH and FADH$$_2 to $$oxygen, creating a proton gradient for ATP synthesis

Question 6

Which of the following best explains why the breakdown of C-H bonds in glucose releases energy?

Accepted Answer

Electrons in C-H bonds are at a higher energy state and move to a lower energy state when transferred to oxygen.

Question 7

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Oxidative Phosphorylation

Question 8

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which process would be most directly affected?

Accepted Answer

The synthesis of ATP from ADP and inorganic phosphate during oxidative phosphorylation

Question 9

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$$^+ in $$the absence of oxygen.

Question 10

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

Accepted Answer

NAD$$^+ is $$reduced to NADH, temporarily storing high-energy electrons for later use in ATP production.

Question 11

A cell is placed in an environment lacking oxygen. Which of the following processes will continue to generate ATP?

Accepted Answer

Glycolysis coupled with fermentation

Question 12

Which of the following is a product of the citric acid cycle that directly donates electrons to the electron transport chain?

Accepted Answer

NADH

Question 13

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

Accepted Answer

Fats contain more C-H bonds, which provide more high-energy electrons for the electron transport chain.

Question 14

Which of the following statements about the chemiosmotic mechanism of ATP synthesis is correct?

Accepted Answer

ATP is synthesized as protons flow down their concentration gradient through ATP synthase.

Question 15

A mutation prevents a cell from converting pyruvate to acetyl-CoA. Which of the following would be a direct consequence?

Accepted Answer

The citric acid cycle would not proceed, and less NADH and FADH$$_2$$ would be produced.

Question 16

Which of the following is a key difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration uses a different molecule such as sulfur.

Question 17

Which of the following best describes the fate of the carbon atoms in glucose during aerobic cellular respiration?

Accepted Answer

They are released as carbon dioxide.

Question 18

Which of the following is an example of a redox reaction in cellular respiration?

Accepted Answer

The transfer of electrons from NADH to the electron transport chain

Question 19

A person is exercising vigorously and their muscles begin to produce lactic acid. Which of the following best explains this phenomenon?

Accepted Answer

The muscles are performing fermentation due to insufficient oxygen, regenerating NAD$$^+$$ for glycolysis.

Question 20

Which of the following best explains why the theoretical yield of ATP from glucose is higher than the actual yield in eukaryotic cells?

Accepted Answer

Some NADH and FADH$$_2$$ are used for anabolic processes and active transport, reducing the net ATP produced.

Cellular Respiration and Energy Extraction from Food

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