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

Question 1

Which of the following best describes the role of activation energy in a chemical reaction?

Accepted Answer

It is the energy required to break the bonds of the reactants and initiate the reaction.

Question 2

In the context of cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

O$$_2$$

Question 3

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

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 4

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

Accepted Answer

2 ATP

Question 5

Which enzyme catalyzes the phosphorylation of glucose to glucose-6-phosphate in the first step of glycolysis?

Accepted Answer

Hexokinase

Question 6

What is the primary function of NAD$$^+ in $$cellular respiration?

Accepted Answer

To transfer electrons from organic molecules to the electron transport chain

Question 7

Which process occurs in the cytoplasm and does not require oxygen?

Accepted Answer

Glycolysis

Question 8

In the analogy shown in the images with beans and turbines, what does the turbine most closely represent in cellular respiration?

Accepted Answer

ATP synthase

Question 9

Which of the following best explains why energy is required to move electrons through the electron transport chain?

Accepted Answer

Electrons move from higher to lower energy states, releasing energy that is used to pump protons across the membrane.

Question 10

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It directly transfers a phosphate group from a substrate to ADP to form ATP.

Question 11

If a cell is deprived of oxygen, which process will continue to function?

Accepted Answer

Glycolysis

Question 12

Which of the following is a correct description of a redox reaction in cellular respiration?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 13

Which step in glycolysis is considered the 'commitment step' and is highly regulated?

Accepted Answer

Conversion of fructose-6-phosphate to fructose-1,6-bisphosphate

Question 14

Which of the following best explains why the breakdown of organic molecules is considered exergonic?

Accepted Answer

It releases energy that can be used to synthesize ATP.

Question 15

In the context of the ecosystem diagram, what is the primary fate of energy that enters as sunlight?

Accepted Answer

It is used to generate organic molecules and eventually lost as heat.

Question 16

Which of the following best describes the fate of pyruvate in the absence of oxygen?

Accepted Answer

It is converted to lactate or ethanol through fermentation.

Question 17

Which enzyme is responsible for the final step of glycolysis, converting phosphoenolpyruvate to pyruvate?

Accepted Answer

Pyruvate kinase

Question 18

Which of the following statements about ATP is correct?

Accepted Answer

ATP is the main energy currency of the cell, used to power most cellular work.

Question 19

Which of the following best explains why enzymes are necessary for cellular respiration?

Accepted Answer

They lower the activation energy, allowing reactions to proceed at a faster rate.

Question 20

Which of the following is a direct product of the energy payoff phase of glycolysis?

Accepted Answer

Pyruvate

Cellular Respiration: Catabolic Pathways and Glycolysis

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