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

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

Question 1

Which of the following best describes the primary function of the organelle shown in the first image (orange structure with internal folds)?

Accepted Answer

Production of ATP through cellular respiration

Question 2

The molecule shown in the third image contains three phosphate groups, a ribose sugar, and an adenine base. What is the name of this molecule, and what is its primary role in the cell?

Accepted Answer

ATP; main energy currency for cellular work

Question 3

Which process is directly powered by the flow of protons (H+) through the enzyme shown in the 17th image (purple structure embedded in a membrane)?

Accepted Answer

Synthesis of ATP from ADP and Pi

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

Why is ATP considered an excellent energy donor in cellular processes?

Accepted Answer

Its phosphate bonds are unstable and release a large amount of energy when broken

Question 7

Which enzyme is responsible for transferring a phosphate group from ATP to another molecule, a process known as phosphorylation?

Accepted Answer

Kinase

Question 8

In the absence of oxygen, which process allows glycolysis to continue by regenerating NAD+ from NADH?

Accepted Answer

Fermentation

Question 9

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

Accepted Answer

Fats have more C-H bonds, which release more energy when oxidized

Question 10

What is the main regulatory enzyme of glycolysis that is allosterically inhibited by ATP and citrate, and stimulated by AMP and ADP?

Accepted Answer

Phosphofructokinase

Question 11

During the electron transport chain, what is the final electron acceptor, and what is formed as a result?

Accepted Answer

O$$_2$$; H$$_2O$$

Question 12

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced by the direct transfer of a phosphate group from a substrate to ADP

Question 13

A muscle cell is rapidly using ATP during intense exercise. Which process is most likely to occur if oxygen is not available?

Accepted Answer

Lactic acid fermentation

Question 14

Which of the following statements about the mitochondrion is TRUE?

Accepted Answer

The inner membrane contains the electron transport chain and ATP synthase

Question 15

Which of the following best explains the evolutionary significance of glycolysis occurring in the cytosol and not requiring oxygen?

Accepted Answer

It is an ancient pathway that allowed early prokaryotes to generate ATP before oxygen was present in the atmosphere

Question 16

If a cell is unable to regenerate NAD+ during glycolysis, what will be the immediate consequence?

Accepted Answer

Glycolysis will stop, and ATP production will decrease

Question 17

Which of the following is a direct result of the feedback inhibition of phosphofructokinase by ATP?

Accepted Answer

Decreased rate of glycolysis

Question 18

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They are electron carriers that donate electrons to the electron transport chain

Question 19

A patient is diagnosed with a genetic disorder that impairs the function of ATP synthase. Which of the following symptoms would most likely be observed?

Accepted Answer

Severely reduced ATP production in cells, especially in tissues with high energy demand

Cellular Respiration and ATP: Harvesting Chemical Energy

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