Question 1

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

Accepted Answer

Eukaryotic cells have their genetic material enclosed within a nucleus, whereas prokaryotic cells do not.

Question 2

Which organelle is primarily responsible for ATP production in eukaryotic cells, and what is its main function?

Accepted Answer

Mitochondrion; generates ATP through oxidative phosphorylation.

Question 3

Which evidence most strongly supports the endosymbiosis theory for the origin of mitochondria and chloroplasts?

Accepted Answer

Both organelles contain circular DNA similar to bacterial genomes.

Question 4

Which equation correctly represents the relationship between Gibbs free energy ($\Delta G$), enthalpy ($\Delta H$), and entropy ($\Delta S$) at constant temperature ($T$)?

Accepted Answer

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

Question 5

A reaction has $\Delta G > 0$. Which of the following best describes this reaction?

Accepted Answer

It is endergonic and requires an input of energy.

Question 6

How do enzymes increase the rate of chemical reactions?

Accepted Answer

By lowering the activation energy ($E_a$) required for the reaction.

Question 7

Which factor would most likely decrease the activity of an enzyme in a human cell?

Accepted Answer

Increasing the temperature to 60°C.

Question 8

Which of the following correctly lists the four interconnected stages of cellular respiration in order?

Accepted Answer

Glycolysis, Pyruvate Oxidation, Citric Acid Cycle, Electron Transport Chain

Question 9

During glycolysis, glucose is converted into which molecule, and what is the net ATP gain per glucose?

Accepted Answer

Pyruvate; 2 ATP

Question 10

Which process occurs in the mitochondria and is responsible for the majority of ATP production during cellular respiration?

Accepted Answer

Electron Transport Chain and Oxidative Phosphorylation

Question 11

Which of the following best explains the difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration uses other molecules.

Question 12

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

Accepted Answer

Oxygen ($O_2$)

Question 13

Which of the following is a major input and output of the light-dependent reactions of photosynthesis?

Accepted Answer

Input: $H_2O$; Output: $O_2$

Question 14

Which pigment is primarily responsible for absorbing light energy in plants, and what color does it reflect?

Accepted Answer

Chlorophyll; reflects green light

Question 15

In the Z scheme of photosynthesis, how is ATP generated?

Accepted Answer

By a proton gradient across the thylakoid membrane driving ATP synthase.

Question 16

Which enzyme catalyzes the first step of carbon fixation in the Calvin cycle?

Accepted Answer

RuBisCO

Question 17

Which adaptation allows C4 and CAM plants to minimize photorespiration?

Accepted Answer

Separating carbon fixation from the Calvin cycle in space or time.

Question 18

During the reduction phase of the Calvin cycle, which molecules are consumed to convert 3-phosphoglycerate into glyceraldehyde-3-phosphate?

Accepted Answer

ATP and NADPH

Question 19

Which of the following best describes the role of the citric acid cycle in cellular respiration?

Accepted Answer

It generates NADH and FADH$_2$ for use in the electron transport chain.

Question 20

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which symptom would most likely result?

Accepted Answer

Decreased ATP production and increased lactic acid buildup.

Core Concepts in Cell Structure, Bioenergetics, and Photosynthesis

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