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

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

Question 1

Which of the following best explains how enzymes speed up chemical reactions in biological systems?

Accepted Answer

They lower the activation energy barrier required for the reaction to proceed.

Question 2

A scientist is studying the effect of pH on the activity of an enzyme that functions in the human stomach. Which of the following is most likely to occur if the pH is increased from 2 to 7?

Accepted Answer

The enzyme will denature, causing a significant decrease in its activity.

Question 3

Which of the following statements correctly distinguishes between competitive and noncompetitive (allosteric) enzyme inhibitors?

Accepted Answer

Competitive inhibitors bind to the active site, while noncompetitive inhibitors bind to a different site on the enzyme.

Question 4

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain, and what is the resulting product?

Accepted Answer

Oxygen; water

Question 5

A patient is experiencing muscle fatigue due to intense exercise. Which metabolic pathway is primarily responsible for the continued production of ATP in the absence of oxygen, and what byproduct is produced?

Accepted Answer

Lactic acid fermentation; lactic acid

Question 6

Which of the following best describes the role of NADH and FADH2 in cellular respiration?

Accepted Answer

They are electron carriers that transport high-energy electrons to the electron transport chain.

Question 7

In glycolysis, one molecule of glucose ($$C_6H_{12}O_6$) is converted into two molecules of pyruvate (C_3H_4O_3$). Which of the following statements is true regarding carbon dioxide production during glycolysis?

Accepted Answer

No carbon dioxide is produced during glycolysis.

Question 8

Why does the inner membrane of the mitochondria have a larger surface area than the outer membrane, and how does this relate to ATP production?

Accepted Answer

It provides more space for the electron transport chain and ATP synthase, increasing ATP production during oxidative phosphorylation.

Question 9

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

Accepted Answer

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

Question 10

A plant cell is exposed to light, and photosynthesis is occurring. Which molecule is being produced as a waste product during the light reactions, and what is its fate in the environment?

Accepted Answer

Oxygen; released into the atmosphere

Question 11

Which of the following best explains why plants have multiple pigments in their chloroplasts?

Accepted Answer

To absorb a broader range of wavelengths of light, maximizing energy capture for photosynthesis.

Question 12

During the Calvin cycle, which gas is taken in by the plant, and through which structure does it enter the leaf?

Accepted Answer

Carbon dioxide; stomata

Question 13

Which of the following statements correctly compares ATP production in cellular respiration and photosynthesis?

Accepted Answer

Both use ATP synthase to produce ATP by utilizing a proton gradient across a membrane.

Question 14

A mutation causes a plant to lack functional NADP+ in its chloroplasts. Which process would be directly affected, and what would be the immediate consequence?

Accepted Answer

The light reactions; inability to transfer electrons to the Calvin cycle

Question 15

Which of the following best describes the relationship between photosynthesis and cellular respiration in the global carbon cycle?

Accepted Answer

Photosynthesis removes carbon dioxide from the atmosphere to build glucose, while cellular respiration releases carbon dioxide by breaking down glucose.

Question 16

Which of the following is a correct description of the ATP-ADP cycle in cells?

Accepted Answer

ATP releases energy when the bond between the second and third phosphate groups is broken, forming ADP and a free phosphate.

Question 17

A cell is placed in an environment lacking oxygen. Which of the following best explains why the electron transport chain (ETC) stops functioning under these conditions?

Accepted Answer

Oxygen is the final electron acceptor in the ETC; without it, electrons cannot be transferred and the chain halts.

Question 18

Which of the following correctly matches the stage of cellular respiration with its location in the cell?

Accepted Answer

Glycolysis: cytoplasm; Krebs cycle: mitochondrial matrix; Electron transport chain: inner mitochondrial membrane

Question 19

Which of the following best explains why the Krebs cycle runs twice for each molecule of glucose that enters cellular respiration?

Accepted Answer

Each glucose molecule produces two molecules of pyruvate, each of which enters the Krebs cycle separately.

Question 20

A researcher adds a competitive inhibitor to an enzyme-catalyzed reaction. Which of the following changes would most likely restore the original reaction rate?

Accepted Answer

Increasing the substrate concentration

Metabolism, Cellular Respiration, and Photosynthesis: Study Guide

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