Question 1

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, allowing for the formation of water.

Question 2

During glycolysis, ATP is both consumed and produced. Which of the following best explains the 'investment' and 'payoff' phases of glycolysis?

Accepted Answer

ATP is consumed in the first steps (investment phase) to phosphorylate glucose, and ATP is produced in later steps (payoff phase) as glucose is split into pyruvate.

Question 3

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ from NADH, allowing glycolysis to continue in the absence of oxygen.

Question 4

A scientist blocks the movement of protons across the inner mitochondrial membrane. What is the most immediate effect on cellular respiration?

Accepted Answer

ATP synthesis by ATP synthase will decrease because the proton-motive force is disrupted.

Question 5

Which of the following is the correct net equation for cellular respiration?

Accepted Answer

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

Question 6

Which molecule acts as an electron carrier during cellular respiration, and what is its reduced form?

Accepted Answer

NAD+ is the electron carrier, and its reduced form is NADH.

Question 7

Which of the following best describes the difference between autotrophs and heterotrophs?

Accepted Answer

Autotrophs produce their own organic molecules from inorganic sources, while heterotrophs obtain organic molecules by consuming other organisms.

Question 8

In photosynthesis, where does the oxygen gas ($$\mathrm{O_2$}) $$released by plants originate?

Accepted Answer

It comes from the splitting of water ($$\mathrm{H_2O}) $$during the light reactions.

Question 9

Which of the following best describes the role of Rubisco in the Calvin cycle?

Accepted Answer

Rubisco catalyzes the fixation of carbon dioxide to ribulose bisphosphate (RuBP).

Question 10

Which of the following statements about the absorption spectrum and action spectrum of photosynthetic pigments is correct?

Accepted Answer

The absorption spectrum shows the wavelengths of light absorbed by pigments, while the action spectrum shows the effectiveness of different wavelengths in driving photosynthesis.

Question 11

Which of the following correctly matches the stage of mitosis with its main event?

Accepted Answer

Metaphase: Chromosomes align at the cell's equator.

Question 12

A cell is observed to have twice the normal amount of DNA, but no visible chromosomes. Which phase of the cell cycle is it most likely in?

Accepted Answer

G2 phase

Question 13

Which of the following statements about checkpoints in the cell cycle is correct?

Accepted Answer

Checkpoints are control mechanisms that ensure the cell only proceeds to the next phase if certain conditions are met.

Question 14

Which of the following best explains why cancer cells can form tumors?

Accepted Answer

Cancer cells lose density-dependent and anchorage-dependent inhibition, allowing uncontrolled cell division.

Question 15

Which of the following is a key difference between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

In mitochondria, the proton gradient is used to synthesize ATP using energy from food; in chloroplasts, it is used to synthesize ATP using energy from light.

Question 16

Which of the following best describes the function of cyclin-dependent kinases (Cdks) in the cell cycle?

Accepted Answer

Cdks, when bound to cyclins, phosphorylate target proteins to regulate progression through the cell cycle.

Question 17

Which of the following is true regarding the final electron acceptor in aerobic and anaerobic respiration?

Accepted Answer

In aerobic respiration, oxygen is the final electron acceptor; in anaerobic respiration, another molecule such as sulfate or nitrate is used.

Question 18

Which of the following best describes the difference between C3, C4, and CAM plants in their use of CO2?

Accepted Answer

C3 plants fix CO2 directly via the Calvin cycle, C4 plants fix CO2 into a four-carbon compound in mesophyll cells, and CAM plants fix CO2 at night and store it for use during the day.

Question 19

Which of the following is a correct statement about feedback inhibition in cellular respiration?

Accepted Answer

ATP and citrate act as inhibitors, while AMP acts as an activator of phosphofructokinase in glycolysis.

Question 20

Which of the following best describes the process of cytokinesis in plant cells?

Accepted Answer

A cell plate forms in the center of the cell, eventually developing into a new cell wall.

Cellular Respiration, Photosynthesis, and the Cell Cycle: Study Guide (Chapters 9, 10, 12)

Study Guide - Practice Questions

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