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

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

Question 1

Which of the following statements best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes lower the activation energy of a reaction, increasing the reaction rate without changing the overall free energy ($$\Delta G).$$

Question 2

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

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

Accepted Answer

Catabolic pathways break down complex molecules, releasing energy, while anabolic pathways build complex molecules and require energy input.

Question 4

Which of the following statements about ATP hydrolysis is correct?

Accepted Answer

ATP hydrolysis releases energy that can be used to drive endergonic reactions in the cell.

Question 5

In glycolysis, which enzyme catalyzes the third step and is regulated by feedback inhibition from ATP and citrate?

Accepted Answer

Phosphofructokinase

Question 6

Which of the following best explains why fermentation occurs in muscle cells during intense exercise?

Accepted Answer

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

Question 7

Which of the following is true regarding the location of the proton gradient and ATP synthesis in mitochondria?

Accepted Answer

The proton gradient is highest in the intermembrane space, and ATP is synthesized in the matrix.

Question 8

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

Accepted Answer

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

Question 9

Which of the following statements about photosynthesis is correct?

Accepted Answer

The carbon in glucose produced during photosynthesis comes from carbon dioxide ($$CO_2).$$

Question 10

Which of the following best describes the function of Rubisco in the Calvin cycle?

Accepted Answer

Rubisco catalyzes the fixation of carbon dioxide ($$CO_2) to $$ribulose bisphosphate (RuBP).

Question 11

Which of the following statements about chemiosmosis in mitochondria and chloroplasts is correct?

Accepted Answer

In both organelles, a proton gradient drives ATP synthesis via ATP synthase.

Question 12

A patient is diagnosed with a genetic disorder that results in nonfunctional dehydrogenase enzymes. Which of the following would most likely be affected in their cells?

Accepted Answer

The transfer of electrons to NAD+ and FAD during cellular respiration.

Question 13

Which of the following best explains why ATP and citrate inhibit phosphofructokinase during glycolysis?

Accepted Answer

They are products of cellular respiration that signal sufficient energy, thus slowing glycolysis through feedback inhibition.

Question 14

Which of the following is a correct comparison between C4 and CAM plants?

Accepted Answer

C4 plants use spatial separation, while CAM plants use temporal separation to minimize photorespiration.

Question 15

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 16

Which of the following is a product of alcoholic fermentation but NOT of lactic acid fermentation?

Accepted Answer

Ethanol

Question 17

Which of the following best explains why the hydrolysis of ATP is considered an energetically favorable process?

Accepted Answer

The process has a negative $$\Delta G$$, indicating it is exergonic and increases the stability of the products.

Question 18

Which of the following statements about the integration of metabolic pathways is correct?

Accepted Answer

Fats, proteins, and carbohydrates can all be broken down and their components fed into cellular respiration.

Question 19

Which of the following best describes the flow of electrons during the light reactions of photosynthesis?

Accepted Answer

Electrons flow from water to NADP+, forming NADPH.

Question 20

A scientist is studying a mutant plant that cannot produce ATP in the chloroplast stroma. Which phase of photosynthesis would be directly affected?

Accepted Answer

The Calvin cycle (light-independent reactions)

Energy, Enzymes, Cellular Respiration, and Photosynthesis: Study Guide

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