Question 1

Which of the following statements best differentiates prokaryotic cells from 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; cellular respiration and ATP synthesis

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 DNA.

Question 4

Which of the following best describes the difference between potential and kinetic energy in the context of chemical reactions?

Accepted Answer

Potential energy is stored in the chemical bonds of molecules, while kinetic energy is the energy of molecular motion.

Question 5

Given the equation for Gibbs free energy: $$ \Delta G = \Delta H - T \Delta S $$, which of the following reactions is endergonic?

Accepted Answer

A reaction with $$ \Delta G \u003e 0 $$

Question 6

How do enzymes catalyze chemical reactions in biological systems?

Accepted Answer

By lowering the activation energy required for the reaction

Question 7

A scientist observes that an enzyme's activity decreases sharply at pH 3 and pH 10, but is highest at pH 7. What does this suggest about the enzyme?

Accepted Answer

The enzyme has an optimal activity at neutral pH, and extreme pH values denature it.

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, which of the following best describes the difference between the energy investment and energy payoff phases?

Accepted Answer

The energy investment phase consumes ATP, while the energy payoff phase produces ATP and NADH.

Question 10

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

Accepted Answer

It oxidizes acetyl-CoA to CO$$_2$$ and generates NADH and FADH$$_2$$ for the electron transport chain.

Question 11

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

Accepted Answer

Oxidative phosphorylation via the electron transport chain

Question 12

Which of the following statements best contrasts fermentation with cellular respiration?

Accepted Answer

Fermentation occurs in the absence of oxygen and produces less ATP than cellular respiration.

Question 13

Which pigment is primarily responsible for absorbing light energy during photosynthesis, and what is its absorption spectrum?

Accepted Answer

Chlorophyll a; absorbs mainly blue and red wavelengths

Question 14

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

Accepted Answer

By a proton gradient across the thylakoid membrane driving ATP synthase

Question 15

Which of the following correctly connects the outputs of the light-dependent reactions to the inputs of the Calvin cycle?

Accepted Answer

The Calvin cycle uses ATP and NADPH produced by the light-dependent reactions to fix CO$$_2$$ into carbohydrates.

Question 16

Which enzyme is responsible for carbon fixation in the Calvin cycle, and what is its significance?

Accepted Answer

RuBisCO; it catalyzes the incorporation of CO$$_2$$ into organic molecules

Question 17

How have C4 and CAM plants adapted to minimize photorespiration?

Accepted Answer

By separating carbon fixation from the Calvin cycle either spatially (C4) or temporally (CAM)

Question 18

A patient has a genetic mutation that impairs the function of their electron transport chain. Which of the following would most likely be observed in their cells?

Accepted Answer

Decreased ATP production and increased reliance on glycolysis for energy

Question 19

If a plant is exposed only to green light, what would you expect to happen to its rate of photosynthesis, and why?

Accepted Answer

The rate of photosynthesis would decrease because chlorophyll reflects green light.

General Biology: Cell Structure, Metabolism, and Photosynthesis Study Guide

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