$$6CO_2 + 12H_2O + \text{Light energy} \rightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 1

Which of the following correctly represents the overall chemical equation for photosynthesis in plants?

Accepted Answer

$$6CO_2 + 12H_2O + 	ext{Light energy} ightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 2

Which structure within the chloroplast is the site of the light reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

What is the primary function of the Calvin cycle in photosynthesis?

Accepted Answer

To use ATP and NADPH to convert $$CO_2$$ into sugar

Question 4

Which pigment is directly involved in the light reactions of photosynthesis?

Accepted Answer

Chlorophyll a

Question 5

During linear electron flow in the light reactions, what is the final electron acceptor?

Accepted Answer

NADP$$^+$$

Question 6

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

Accepted Answer

It donates electrons to replace those lost by P680 in Photosystem II

Question 7

A plant is exposed to only green light. What is the most likely effect on the rate of photosynthesis, and why?

Accepted Answer

The rate will decrease because chlorophyll reflects green light

Question 8

Which of the following statements about chemiosmosis in chloroplasts and mitochondria is correct?

Accepted Answer

In chloroplasts, protons are pumped into the thylakoid space; in mitochondria, protons are pumped into the intermembrane space

Question 9

Which enzyme catalyzes the fixation of $$CO_2 in $$the Calvin cycle?

Accepted Answer

Rubisco (Ribulose bisphosphate carboxylase/oxygenase)

Question 10

What is the main adaptive advantage of C$$_4$$ plants over C$$_3$$ plants in hot, dry environments?

Accepted Answer

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

Question 11

Which of the following is a correct description of CAM plants?

Accepted Answer

They open their stomata at night to fix $$CO_2$$ into organic acids

Question 12

Which of the following best explains why photorespiration is considered wasteful for C$$_3$$ plants?

Accepted Answer

It consumes organic fuel and $$O_2$$ without producing ATP or sugar

Question 13

A scientist uses a spectrophotometer to measure the absorption spectrum of a pigment. What does the absorption spectrum show?

Accepted Answer

The wavelengths of light absorbed by the pigment

Question 14

Which of the following is a product of cyclic electron flow in the light reactions?

Accepted Answer

ATP

Question 15

In the Calvin cycle, how many turns are required to produce one net molecule of glyceraldehyde-3-phosphate (G3P)?

Accepted Answer

Three

Question 16

Which of the following best describes the energy transformation that occurs during photosynthesis?

Accepted Answer

Light energy is converted to chemical energy

Question 17

Which of the following statements about the action spectrum of photosynthesis is correct?

Accepted Answer

It is broader than the absorption spectrum of chlorophyll a due to accessory pigments

Question 18

A mutation disables the enzyme NADP$$^+$$ reductase in a plant cell. Which of the following would be directly affected?

Accepted Answer

The reduction of NADP$$^+ to $$NADPH

Question 19

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

Accepted Answer

Both use ATP synthase to couple proton diffusion to ATP synthesis

Question 20

Which of the following best explains why C$$_4$$ and CAM plants have evolved in hot, arid environments?

Accepted Answer

To minimize water loss and reduce photorespiration

Photosynthesis: Mechanisms, Pathways, and Adaptations

스터디 가이드 - 연습 문제