$$CO_2 + H_2A$$ \xrightarrow{\text{Light Energy}} CH_2O + H_2O + 2A^*$$

Question 1

Which of the following best describes the main difference between oxidative and reductive processes in the carbon cycle?

Accepted Answer

Oxidative processes break down carbohydrates, while reductive processes build carbohydrates from CO2.

Question 2

Which equation correctly represents the photosynthetic process that utilizes water as the reductant?

Accepted Answer

$$CO_2 + H_2A$$ \xrightarrow{	ext{Light Energy}} CH_2O + H_2O + 2A^*$$

Question 3

Which of the following is NOT a possible reductant used in photosynthetic processes?

Accepted Answer

$$O_2$$

Question 4

Where do the light reactions of photosynthesis occur within the chloroplast?

Accepted Answer

Thylakoid membrane

Question 5

Which of the following is a product of the dark reactions in photosynthesis?

Accepted Answer

Carbohydrates

Question 6

Which organelle is responsible for the catabolism of fuel molecules to produce ATP?

Accepted Answer

Mitochondrion

Question 7

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

Accepted Answer

Chloroplasts are involved in the reduction of $$CO_2 to $$carbohydrates.

Question 8

Which of the following is a similarity between mitochondria and chloroplasts?

Accepted Answer

Both use a proton gradient to drive ATP synthesis.

Question 9

Which molecule is reduced during the light reactions of photosynthesis?

Accepted Answer

NADP+

Question 10

A plant cell is exposed to light, but its thylakoid membranes are damaged. Which process will be most directly affected?

Accepted Answer

Production of ATP and NADPH

Question 11

Which of the following best explains why both oxidative and reductive processes are essential for life?

Accepted Answer

They enable the cycling of carbon and the production of $$O_2$$ and carbohydrates.

Question 12

Where is starch stored in the chloroplast?

Accepted Answer

Stroma

Question 13

Which of the following is a correct description of the dark reactions of photosynthesis?

Accepted Answer

They use ATP and NADPH to convert $$CO_2$$ into carbohydrates.

Question 14

Which of the following is a plausible consequence if the inner membrane of the chloroplast is damaged?

Accepted Answer

ATP synthesis in the stroma would be impaired.

Question 15

Which of the following is a product of the light reactions in photosynthesis?

Accepted Answer

NADPH

Question 16

Which of the following is a correct pairing of location and process in the chloroplast?

Accepted Answer

Thylakoid membrane – Light reactions

Question 17

Which of the following is a correct statement about the endosymbiotic theory as it relates to chloroplasts?

Accepted Answer

Chloroplasts have their own DNA and ribosomes, supporting the endosymbiotic theory.

Question 18

Which of the following is a correct description of the role of mitochondria in the carbon cycle?

Accepted Answer

Mitochondria break down carbohydrates to release $$CO_2.$$

Question 19

Which of the following is a correct description of the structure labeled 'granum' in the chloroplast diagram?

Accepted Answer

A stack of thylakoid membranes

Question 20

Which of the following best describes the relationship between the light and dark reactions of photosynthesis?

Accepted Answer

Light reactions provide ATP and NADPH for the dark reactions.

Chapter 15 – Photosynthesis: Mechanisms and Structures

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