Question 1

Which of the following best describes the process of chemiosmosis in cellular respiration?

Accepted Answer

The movement of hydrogen ions across a membrane to generate ATP using ATP synthase.

Question 2

A plant is exposed to intense sunlight and high temperatures. Which adaptation would most likely help it minimize photorespiration and maximize sugar production?

Accepted Answer

Using C4 photosynthesis to concentrate $$\mathrm{CO_2$}$$ around rubisco.

Question 3

During the light reactions of photosynthesis, which of the following occurs in the thylakoid membrane?

Accepted Answer

Water is split, releasing $$\mathrm{O_2$}$$, and ATP and NADPH are produced.

Question 4

Which of the following statements about linear and cyclic electron flow in photosynthesis is correct?

Accepted Answer

Linear electron flow produces both ATP and NADPH, while cyclic electron flow produces only extra ATP.

Question 5

If an organism lacks Photosystem II, which of the following would it be unable to produce?

Accepted Answer

Oxygen ($$\mathrm{O_2$}) $$from the splitting of water.

Question 6

Which of the following best describes the role of rubisco in photosynthesis?

Accepted Answer

It catalyzes the fixation of $$\mathrm{CO_2$} to $$form organic molecules in the Calvin cycle.

Question 7

Which of the following is a correct sequence for the flow of electrons during aerobic respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH/FADH$$_2$$ $$\rightarrow$$ Electron Transport Chain $$\rightarrow$$ Oxygen

Question 8

Which of the following statements about glycolysis is true?

Accepted Answer

It occurs in the cytoplasm and produces a net gain of 2 ATP by substrate-level phosphorylation.

Question 9

A facultative anaerobe is an organism that:

Accepted Answer

Can survive with or without oxygen by switching between aerobic and anaerobic metabolism.

Question 10

Which of the following best explains why CAM plants are well-adapted to arid environments?

Accepted Answer

They open their stomata at night to take in $$\mathrm{CO_2$}$$ and store it for use during the day, reducing water loss.

Question 11

Which of the following is a function of carotenoids in photosynthetic organisms?

Accepted Answer

They absorb additional wavelengths of light and help protect the plant from excess light.

Question 12

During which stage of cellular respiration is the majority of ATP produced, and by what mechanism?

Accepted Answer

Oxidative phosphorylation (electron transport chain) via chemiosmosis.

Question 13

Which of the following best describes the difference between aerobic respiration and fermentation?

Accepted Answer

Aerobic respiration uses an electron transport chain with oxygen as the final electron acceptor, while fermentation does not use an electron transport chain.

Question 14

Which of the following is a direct product of pyruvate oxidation in eukaryotic cells?

Accepted Answer

Acetyl-CoA, NADH, and $$\mathrm{CO_2$}$$

Question 15

Why is it beneficial for plants to have multiple photosynthetic pigments that absorb at various wavelengths?

Accepted Answer

It allows them to capture more energy from sunlight by absorbing a broader range of wavelengths.

Question 16

Which enzyme is responsible for regulating the rate of glycolysis in response to the cell's energy needs?

Accepted Answer

Phosphofructokinase

Question 17

Which of the following is an example of oxidation in a biological system?

Accepted Answer

A molecule loses electrons during a reaction.

Question 18

A mutation causes a plant's stomata to remain closed during the day. Which of the following is a likely consequence?

Accepted Answer

Reduced $$\mathrm{CO_2$}$$ uptake, leading to decreased photosynthesis.

Question 19

Which of the following best describes the main difference between obligate and facultative anaerobes?

Accepted Answer

Obligate anaerobes cannot survive in the presence of oxygen, while facultative anaerobes can survive with or without oxygen.

Question 20

Which of the following is a correct description of reduction in a biological redox reaction?

Accepted Answer

A molecule gains electrons during the reaction.

Photosynthesis and Respiration Study Guide – General Biology

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