Question 1

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

Accepted Answer

Catabolic pathways break down complex molecules into simpler ones, releasing energy, while anabolic pathways build complex molecules from simpler ones, requiring energy input.

Question 2

A reaction has a negative free energy change ($$\Delta G \u003c 0). $$Which statement is most accurate regarding this reaction?

Accepted Answer

The reaction is exergonic and will occur spontaneously.

Question 3

Which equation correctly describes the relationship between free energy, enthalpy, entropy, and temperature?

Accepted Answer

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

Question 4

Which of the following best explains how ATP performs cellular work?

Accepted Answer

ATP transfers a phosphate group to target molecules, causing a conformational change that drives cellular work.

Question 5

During glycolysis, which phase requires an input of ATP, and what is the purpose of this investment?

Accepted Answer

Energy investment phase; to phosphorylate glucose and destabilize it for subsequent breakdown.

Question 6

Which molecule is regenerated at the end of the citric acid cycle, allowing the cycle to continue?

Accepted Answer

Oxaloacetate

Question 7

In the electron transport chain of mitochondria, what is the primary function of the protein complexes?

Accepted Answer

To transfer electrons and pump protons across the inner mitochondrial membrane, creating a proton gradient.

Question 8

Which process produces ATP by substrate-level phosphorylation, and where does it occur?

Accepted Answer

Glycolysis and citric acid cycle; cytosol and mitochondrial matrix

Question 9

Which of the following is a major difference between oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts?

Accepted Answer

Oxidative phosphorylation uses oxygen as the final electron acceptor, while photophosphorylation uses NADP+.

Question 10

Which pigment is primarily responsible for absorbing light energy during photosynthesis in plants?

Accepted Answer

Chlorophyll a

Question 11

Photorespiration is considered wasteful for C3 plants because:

Accepted Answer

It consumes oxygen and releases carbon dioxide, reducing the efficiency of photosynthesis.

Question 12

Which adaptation allows C4 and CAM plants to minimize photorespiration?

Accepted Answer

Spatial or temporal separation of carbon fixation from the Calvin cycle.

Question 13

Which of the following best describes the role of NAD+/NADH in cellular respiration?

Accepted Answer

NAD+ acts as an electron acceptor, becoming NADH, which then donates electrons to the electron transport chain.

Question 14

Which of the following is a correct balanced equation for aerobic cellular respiration?

Accepted Answer

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

Question 15

Which of the following best describes the function of ATP synthase in mitochondria?

Accepted Answer

It uses the flow of protons down their gradient to synthesize ATP from ADP and inorganic phosphate.

Question 16

Which of the following is NOT a component of a chloroplast?

Accepted Answer

Cristae

Question 17

Which type of cell signaling involves hormones traveling through the bloodstream to reach distant target cells?

Accepted Answer

Endocrine signaling

Question 18

Which of the following is a correct sequence for the three stages of cell signaling?

Accepted Answer

Signal Reception, Signal Transduction, Cellular Response

Question 19

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 20

Which of the following best describes the role of second messengers in cell signaling?

Accepted Answer

They amplify the signal inside the cell, allowing for a larger cellular response.

Comprehensive Study Guide for College Biology: Energy, Respiration, Photosynthesis, and Cell Signaling

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