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

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 so the reaction can proceed.

Question 2

Which equation 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 3

In the context of redox reactions during cellular respiration, which statement is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 4

Which molecule acts as the primary electron carrier during glycolysis and the citric acid cycle?

Accepted Answer

NADH

Question 5

What is the main purpose of the electron transport chain in mitochondria?

Accepted Answer

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

Question 6

Which process occurs in the cytoplasm and results in the formation of pyruvate?

Accepted Answer

Glycolysis

Question 7

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

Accepted Answer

2 ATP

Question 8

Which of the following best explains why ATP is often called the 'energy currency' of the cell?

Accepted Answer

ATP directly powers most cellular work by transferring a phosphate group to other molecules.

Question 9

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation is a partial degradation of sugars that occurs without oxygen.

Question 10

A patient is unable to efficiently convert NADH back to NAD$$^+ in $$their mitochondria. Which process would be most directly affected?

Accepted Answer

Electron transport chain

Question 11

Which enzyme catalyzes the phosphorylation of glucose in the first step of glycolysis?

Accepted Answer

Hexokinase

Question 12

In the context of the illustrated ball-and-paddle analogy for cellular respiration, what does the paddle wheel represent?

Accepted Answer

The electron transport chain

Question 13

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group from a substrate to ADP to form ATP

Question 14

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

Accepted Answer

Glycolysis

Question 15

Which of the following is a correct description of the fate of glucose carbons during aerobic respiration?

Accepted Answer

They are released as carbon dioxide.

Question 16

A mutation in phosphofructokinase would most directly affect which metabolic pathway?

Accepted Answer

Glycolysis

Question 17

Which of the following best explains why energy is released in a stepwise manner during cellular respiration?

Accepted Answer

To prevent the cell from overheating and to efficiently capture energy in ATP

Question 18

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvate

Question 19

Which of the following statements about the flow of energy in ecosystems is correct?

Accepted Answer

Energy enters as sunlight and leaves as heat.

Cellular Respiration: Catabolic Pathways and Glycolysis

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