Question 1

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

Accepted Answer

Autotrophs synthesize their own organic molecules from inorganic sources, while heterotrophs must consume organic molecules produced by other organisms.

Question 2

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 3

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

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

Question 4

Which process in cellular respiration produces the most ATP per molecule of glucose?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 5

In photosynthesis, what is the primary function of the light-dependent reactions?

Accepted Answer

To generate ATP and NADPH needed for the Calvin cycle

Question 6

Which of the following best explains why plants use both photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases that energy for cellular work.

Question 7

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its phosphate bonds, which can be released during hydrolysis.

Question 8

A plant cell is exposed to a toxin that inhibits the function of ATP synthase. Which process will be most directly affected?

Accepted Answer

Electron transport chain

Question 9

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 10

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They transport electrons to the electron transport chain for ATP production.

Question 11

Which of the following is NOT a function of carbohydrates in living organisms?

Accepted Answer

Catalyzing chemical reactions

Question 12

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

It uses ATP and NADPH to convert carbon dioxide into glucose.

Question 13

A mutation causes a plant to lack the enzyme Rubisco. What would be the most immediate effect on the plant?

Accepted Answer

The plant would be unable to fix carbon dioxide during the Calvin cycle.

Question 14

Which of the following best explains why C$$_4$$ plants are more efficient than C$$_3$$ plants in hot, dry environments?

Accepted Answer

C$$_4$$ plants minimize photorespiration by spatially separating carbon fixation from the Calvin cycle.

Question 15

Which of the following is the correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Citric acid cycle $$\rightarrow$$ Electron transport chain

Question 16

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

Accepted Answer

Water is split to provide electrons and protons for the light-dependent reactions.

Question 17

Which of the following is a product of fermentation in muscle cells under anaerobic conditions?

Accepted Answer

Lactic acid

Question 18

Which of the following macromolecules is primarily responsible for catalyzing chemical reactions in cells?

Accepted Answer

Proteins (enzymes)

Question 19

A scientist measures the rate of oxygen production in a plant exposed to increasing light intensity. Which process is being measured?

Accepted Answer

Photosynthesis

Question 20

Which of the following statements about the relationship between photosynthesis and cellular respiration is correct?

Accepted Answer

Photosynthesis produces glucose and oxygen, which are used in cellular respiration to produce ATP, carbon dioxide, and water.

General Biology Study Guide: Cellular Respiration, Photosynthesis, and Carbohydrates

Study Guide - Practice Questions

Study Guide - Flashcards