Q: Which of the following scenarios illustrates energetic coupling in cellular metabolism?

The hydrolysis of ATP ($\Delta G = -30.5$ kJ/mol) is used to drive the phosphorylation of glucose ($\Delta G = +13.8$ kJ/mol).

Q: Which of the following best explains how enzymes increase the rate of chemical reactions?

They lower the activation energy ($E_a$) required for the reaction.

Q: A patient is diagnosed with a genetic disorder that prevents the production of coenzymes. Which of the following cellular processes would most likely be directly affected?

The ability of enzymes to catalyze reactions that require electron carriers such as NAD+.

Q: Which of the following is a correct sequence of events in aerobic cellular respiration?

Glycolysis → Pyruvate oxidation → Citric acid cycle → Electron transport chain

Q: During glycolysis, what are the net inputs and outputs per molecule of glucose?

Inputs: 1 glucose, 2 ATP; Outputs: 2 pyruvate, 2 NADH, 2 ATP (net)

Question 1

Which of the following best explains why eukaryotic cells can carry out more specialized functions than prokaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles that compartmentalize cellular processes.

Question 2

A muscle cell requires large amounts of ATP for contraction. Which organelle would you expect to be especially abundant in muscle cells, and why?

Accepted Answer

Mitochondria, because they are the site of aerobic cellular respiration and ATP production.

Question 3

Which of the following statements about the cytoskeleton is correct?

Accepted Answer

Intermediate filaments provide structural support and help maintain cell shape.

Question 4

Which process best describes how lysosomes recycle cellular material?

Accepted Answer

Autophagy, where lysosomes digest and recycle damaged organelles.

Question 5

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy and has $\Delta G < 0$.

Question 6

Which of the following scenarios illustrates energetic coupling in cellular metabolism?

Accepted Answer

The hydrolysis of ATP ($\Delta G = -30.5$ kJ/mol) is used to drive the phosphorylation of glucose ($\Delta G = +13.8$ kJ/mol).

Question 7

Which of the following best explains how enzymes increase the rate of chemical reactions?

Accepted Answer

They lower the activation energy ($E_a$) required for the reaction.

Question 8

A patient is diagnosed with a genetic disorder that prevents the production of coenzymes. Which of the following cellular processes would most likely be directly affected?

Accepted Answer

The ability of enzymes to catalyze reactions that require electron carriers such as NAD+.

Question 9

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Pyruvate oxidation → Citric acid cycle → Electron transport chain

Question 10

During glycolysis, what are the net inputs and outputs per molecule of glucose?

Accepted Answer

Inputs: 1 glucose, 2 ATP; Outputs: 2 pyruvate, 2 NADH, 2 ATP (net)

Question 11

Which of the following best describes the role of oxygen in cellular respiration?

Accepted Answer

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

Question 12

Which of the following statements correctly compares fermentation and aerobic respiration?

Accepted Answer

Fermentation regenerates NAD+ to allow glycolysis to continue in the absence of oxygen.

Question 13

Which of the following best describes the function of pigments in photosynthesis?

Accepted Answer

They absorb light energy and transfer it to the reaction center.

Question 14

In the Z-scheme of photosynthesis, what is the correct order of electron flow?

Accepted Answer

Photosystem II → Electron transport chain → Photosystem I → NADP+

Question 15

Which of the following statements best explains why C4 and CAM plants have evolved alternative pathways for carbon fixation?

Accepted Answer

To minimize water loss and photorespiration in hot, dry environments.

Question 16

Which of the following is a key difference between C3 and C4 photosynthetic pathways?

Accepted Answer

C3 plants fix CO2 directly via rubisco, while C4 plants initially fix CO2 into a four-carbon compound.

Question 17

Which of the following best describes the relationship between the electron transport chain and ATP synthase in cellular respiration?

Accepted Answer

The electron transport chain creates a proton gradient that drives ATP synthesis via ATP synthase.

Question 18

Which environmental factor would most likely decrease the rate of an enzyme-catalyzed reaction in the human body?

Accepted Answer

A decrease in temperature from 37°C to 20°C.

Question 19

A cell is observed to have an abundance of rough endoplasmic reticulum. Which function is this cell most likely specialized for?

Accepted Answer

Synthesis of proteins for export or for membranes.

Cell Structure, Metabolism, Cellular Respiration, and Photosynthesis: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards