Question 1

Which of the following statements is NOT a component of the modern cell theory?

Accepted Answer

All cells contain a nucleus to store genetic material.

Question 2

Which of the following best describes a key structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus surrounded by a double membrane, while prokaryotic cells lack a true nucleus.

Question 3

Which organelle is primarily responsible for the synthesis of ATP through oxidative phosphorylation in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 4

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 5

Which of the following equations correctly represents Gibbs' Free Energy change for a reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 6

A reaction with $$\Delta G \u003c 0 is $$best described as:

Accepted Answer

Exergonic and releases energy.

Question 7

Which of the following statements correctly distinguishes catabolism from anabolism?

Accepted Answer

Catabolism involves the breakdown of molecules and is generally exergonic, while anabolism involves synthesis and is generally endergonic.

Question 8

Which of the following best describes how ATP transfers energy to other molecules?

Accepted Answer

By donating a phosphate group through hydrolysis, releasing energy that can be used to drive endergonic reactions.

Question 9

Which of the following is a coenzyme involved in cellular respiration?

Accepted Answer

NAD+

Question 10

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

Accepted Answer

They lower the activation energy, increasing the rate of reaction without being consumed.

Question 11

How does increasing the temperature generally affect enzyme-catalyzed reaction rates, and what happens if the temperature becomes too high?

Accepted Answer

Reaction rate increases up to an optimal temperature, then decreases sharply as the enzyme denatures.

Question 12

Which of the following is an example of feedback inhibition in metabolic pathways?

Accepted Answer

A product of a pathway binds to an enzyme early in the pathway, decreasing its activity.

Question 13

During aerobic cellular respiration, what is the final electron acceptor in the electron transport system (ETS)?

Accepted Answer

Oxygen ($$O_2)$$

Question 14

Which of the following best explains the role of the concentration gradient in ATP synthesis during chemiosmosis?

Accepted Answer

A gradient of protons ($$H^+) $$across the inner mitochondrial membrane drives ATP synthesis as protons flow through ATP synthase.

Question 15

If a poison blocks the function of ATP synthase, which of the following would be the most immediate effect on cellular respiration?

Accepted Answer

Protons would no longer flow back into the mitochondrial matrix, and ATP production would decrease sharply.

Question 16

Which of the following correctly matches the pathway with its main products during aerobic respiration?

Accepted Answer

Glycolysis: 2 ATP, 2 NADH, 2 pyruvate

Question 17

During aerobic respiration, what happens to the six carbons originally present in a glucose molecule?

Accepted Answer

They are converted into six molecules of carbon dioxide ($$CO_2) $$and released during the Krebs cycle and pyruvate oxidation.

Question 18

Which of the following best describes the relationship between oxidation and reduction in biological systems?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons; they are always coupled.

Question 19

A patient is diagnosed with a genetic disorder that results in nonfunctional lysosomes. Which cellular process would be most directly affected?

Accepted Answer

Intracellular digestion of macromolecules

Question 20

Which of the following best explains why the second law of thermodynamics is important for ATP production in mitochondria?

Accepted Answer

It states that energy transformations increase entropy, so the flow of protons down their concentration gradient through ATP synthase is a spontaneous process that drives ATP synthesis.

General Biology Study Guide: Cell Structure, Metabolism, and Cellular Respiration

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