Q: Which of the following best describes the overall chemical equation for photosynthesis?

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

Question 1

Which of the following best describes the overall chemical equation for photosynthesis?

Accepted Answer

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

Question 2

Where do the light reactions of photosynthesis take place within the chloroplast?

Accepted Answer

In the thylakoid membrane and lumen

Question 3

What is the primary function of Photosystem II (PSII) in the light reactions?

Accepted Answer

To use light energy to create high energy electrons for the electron transport chain and replace electrons by splitting water

Question 4

Which of the following is a direct product of the Calvin cycle?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 5

During the light reactions, what is the role of ATP synthase?

Accepted Answer

It uses the proton gradient in the lumen to synthesize ATP from ADP and $$P_i$$

Question 6

Which molecule is regenerated at the end of the Calvin cycle to allow the cycle to continue?

Accepted Answer

Ribulose bisphosphate (RuBP)

Question 7

What is the main purpose of the Calvin cycle in photosynthesis?

Accepted Answer

To use ATP and NADPH to convert carbon dioxide into G3P (a sugar)

Question 8

Which of the following best describes the flow of electrons during the light reactions?

Accepted Answer

From water to PSII to ETC to PSI to NADP+

Question 9

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

Accepted Answer

Rubisco

Question 10

What are the products of the light reactions that are used in the Calvin cycle?

Accepted Answer

ATP and NADPH

Question 11

If a plant is exposed to a chemical that inhibits the function of NADP+ reductase, which of the following would be directly affected?

Accepted Answer

The production of NADPH

Question 12

Which of the following statements about the splitting of water in photosynthesis is correct?

Accepted Answer

It provides electrons for the light reactions and releases oxygen as a by-product

Question 13

Which of the following best explains why photosynthesis is considered an endergonic process?

Accepted Answer

It requires an input of energy from light to drive the reaction

Question 14

In which part of the chloroplast does the Calvin cycle take place?

Accepted Answer

Stroma

Question 15

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 16

A mutation disables the ATP synthase enzyme in a plant cell. Which process would be most directly affected?

Accepted Answer

The synthesis of ATP during the light reactions

Question 17

Which of the following best describes the role of the electron transport chain (ETC) in the light reactions?

Accepted Answer

It uses high energy electrons from PSII to pump protons into the lumen, creating a proton gradient

Question 18

Which of the following is a correct sequence of events in the Calvin cycle?

Accepted Answer

Carbon fixation, reduction, regeneration

Question 19

What would happen if a plant could not regenerate ribulose bisphosphate (RuBP) in the Calvin cycle?

Accepted Answer

The Calvin cycle would stop because CO2 could not be fixed

Question 20

Which of the following best explains the relationship between the light reactions and the Calvin cycle?

Accepted Answer

The light reactions provide ATP and NADPH to the Calvin cycle, which uses them to fix carbon dioxide into sugar

Lecture 16

Guida di studio - Domande di pratica

Study guide - Flashcard