Q: Which equation best represents the overall process of photosynthesis?

$$6\ \text{CO}_2 + 6\ \text{H}_2\text{O} + \text{light energy} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\ \text{O}_2$$

Question 1

Which structure in the chloroplast is directly responsible for the light reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 2

What is the primary function of photosynthesis in plants?

Accepted Answer

Convert light energy to chemical potential energy cells can use

Question 3

If a plant is grown in complete darkness, what will happen to it?

Accepted Answer

It would die because it would not have a source of energy.

Question 4

During the light reactions of photosynthesis, what happens when light of a usable wavelength strikes a chlorophyll molecule?

Accepted Answer

An electron in chlorophyll is excited to a higher energy level.

Question 5

Which of the following is a product of the light reactions that is used in the Calvin cycle?

Accepted Answer

NADPH

Question 6

How many molecules of CO$$_2$$ must be fixed by the Calvin cycle to produce one molecule of G3P that can exit the cycle?

Accepted Answer

3

Question 7

Which enzyme is responsible for the fixation of carbon dioxide in the Calvin cycle?

Accepted Answer

Rubisco

Question 8

What is the main function of rubisco in photosynthesis?

Accepted Answer

It catalyzes the fixation of CO$$_2 to $$RuBP.

Question 9

Which of the following correctly describes a reduction step in photosynthesis?

Accepted Answer

NADP$$^+ is $$reduced to NADPH during the light reactions.

Question 10

Which phase of the Calvin cycle involves the regeneration of RuBP?

Accepted Answer

Regeneration

Question 11

What is the structural polysaccharide plants synthesize as part of their cell walls?

Accepted Answer

Cellulose

Question 12

Which of the following best describes the tertiary structure of rubisco?

Accepted Answer

The 3D folded configuration of each individual polypeptide formed by interactions between R groups

Question 13

Light energy captured by photosystem II (PSII) is used to ___________.

Accepted Answer

Generate an H$$^+$$ gradient across the thylakoid membrane

Question 14

PS I takes in light energy. This energy ends up being used to _______.

Accepted Answer

Produce NADPH

Question 15

Which of the following is a storage polysaccharide plants synthesize as a source of potential energy?

Accepted Answer

Starch

Question 16

How are C4 and CAM photosynthesis different from the 'standard' C3 photosynthesis?

Accepted Answer

They use a second cycle to capture CO$$_2$$ and maintain high CO$$_2$$ levels for the Calvin cycle even when the stomates are closed.

Question 17

A herbicide makes the thylakoid membranes permeable to hydrogen ions. What effect would this have on the light reactions?

Accepted Answer

ATP production would halt because the H$$^+$$ gradient would be lost.

Question 18

A group of students measures CO$$_2$$ levels around a plant under different light treatments. Which treatment would result in the lowest net photosynthesis?

Accepted Answer

Green light

Question 19

Which equation best represents the overall process of photosynthesis?

Accepted Answer

$$6\ 	ext{CO}_2 + 6\ 	ext{H}_2	ext{O} + 	ext{light energy} ightarrow 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6\ 	ext{O}_2$$

Question 20

Which molecule is directly produced by photosynthesis and can be used to synthesize glucose?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

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