Q: Which of the following equations correctly represents the summary of cellular respiration?

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

Question 1

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

Accepted Answer

ATP stores energy by coupling exergonic and endergonic reactions, allowing energy released from catabolic reactions to power anabolic reactions.

Question 2

In the context of enzyme function, what is the effect of a competitive inhibitor?

Accepted Answer

It binds to the active site, preventing the substrate from binding and thus decreasing the rate of reaction.

Question 3

Which of the following equations correctly represents the summary of 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 are the net products generated from one molecule of glucose?

Accepted Answer

2 ATP, 2 NADH, and 2 pyruvate

Question 5

Which of the following statements about the citric acid cycle is correct?

Accepted Answer

It produces ATP, NADH, FADH2, and releases CO2 as a waste product.

Question 6

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

Accepted Answer

To create a proton gradient across the inner mitochondrial membrane, which drives ATP synthesis via chemiosmosis.

Question 7

Which molecule is the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

O2

Question 8

Which of the following best explains why enzymes are specific to the reactions they catalyze?

Accepted Answer

The shape and charge of the enzyme's active site only allow specific substrates to bind.

Question 9

Which of the following changes would most likely decrease the rate of an enzyme-catalyzed reaction?

Accepted Answer

Increasing the substrate concentration to a point, then adding a noncompetitive inhibitor.

Question 10

Which of the following best describes the process of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway binds to an allosteric site on an enzyme earlier in the pathway, decreasing its activity.

Question 11

Which of the following statements about the relationship between free energy ($$\Delta G) $$and reaction spontaneity is correct?

Accepted Answer

A reaction with $$\Delta G \u003c 0 is $$spontaneous.

Question 12

Which of the following best describes the difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a substrate, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 13

Which of the following is a correct statement about the role of NAD+ in cellular respiration?

Accepted Answer

NAD+ acts as an electron carrier, accepting electrons and becoming reduced to NADH.

Question 14

Which of the following best explains why high temperatures can denature enzymes and reduce their activity?

Accepted Answer

High temperatures disrupt the hydrogen bonds and other interactions that maintain the enzyme's three-dimensional structure.

Question 15

Which of the following is a correct description of the role of oxygen in aerobic cellular respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, forming water.

Question 16

Which of the following best describes the difference between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways break down complex molecules to release energy, while anabolic pathways use energy to build complex molecules.

Question 17

Which of the following is a real-life example of feedback inhibition in metabolism?

Accepted Answer

The inhibition of phosphofructokinase by ATP in glycolysis.

Question 18

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 19

Which of the following best explains why glycolysis is considered an ancient metabolic pathway shared by all life forms?

Accepted Answer

Glycolysis occurs in the cytosol and does not require oxygen, making it possible in both aerobic and anaerobic environments.

Cellular Energetics: Metabolism, Enzymes, Cellular Respiration, and Photosynthesis

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