Question 1

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

Accepted Answer

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

Question 2

During the light reactions of photosynthesis, which molecule is split to provide electrons, and what is released as a by-product?

Accepted Answer

Water is split, releasing oxygen as a by-product.

Question 3

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

Accepted Answer

It uses ATP and NADPH to convert CO$$_2$$ into G3P.

Question 4

What is the main function of chlorophyll in photosynthesis?

Accepted Answer

To absorb light energy and transfer it to reaction-center chlorophyll a.

Question 5

Which of the following best explains why leaves appear green?

Accepted Answer

Chlorophyll absorbs violet-blue and red light, reflecting and transmitting green light.

Question 6

In the process of chemiosmosis in chloroplasts, where are protons pumped and where does ATP synthesis occur?

Accepted Answer

Protons are pumped into the thylakoid space; ATP synthesis occurs on the stroma side of the membrane.

Question 7

Which pigment is the primary light-capturing pigment in chloroplasts?

Accepted Answer

Chlorophyll a

Question 8

What is the role of NADP$$^+ in $$the light reactions of photosynthesis?

Accepted Answer

It acts as an electron acceptor, becoming reduced to NADPH.

Question 9

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

Accepted Answer

Both use an electron transport chain to create a proton gradient that drives ATP synthesis.

Question 10

Which of the following best describes the fate of the oxygen atoms in water during photosynthesis?

Accepted Answer

They are released as O$$_2$$ gas.

Question 11

A plant is exposed only to green light. What will most likely happen to its rate of photosynthesis?

Accepted Answer

It will decrease, because chlorophyll reflects green light.

Question 12

Which enzyme catalyzes the fixation of CO$$_2 in $$the Calvin cycle?

Accepted Answer

Rubisco (Ribulose bisphosphate carboxylase/oxygenase)

Question 13

What is the main purpose of cyclic electron flow in the light reactions?

Accepted Answer

To produce additional ATP without producing NADPH or O$$_2$$

Question 14

Which of the following is a product of the Calvin cycle that can be used to synthesize glucose and other carbohydrates?

Accepted Answer

Glyceraldehyde 3-phosphate (G3P)

Question 15

If a plant's thylakoid membranes were punctured so that the interior of the thylakoid was no longer separated from the stroma, which process would be most directly affected?

Accepted Answer

Synthesis of ATP

Question 16

Which of the following best explains why accessory pigments such as carotenoids are important in photosynthesis?

Accepted Answer

They broaden the spectrum of light that can be used for photosynthesis and protect chlorophyll from damage.

Question 17

Which of the following is true about the energy transformation in photosynthesis?

Accepted Answer

Light energy is converted into chemical energy stored in glucose.

Question 18

A scientist exposes a plant to light with a wavelength of 700 nm. Which photosystem will be most directly excited?

Accepted Answer

Photosystem I (P700)

Question 19

Which of the following is a correct statement about the relationship between wavelength and energy of light?

Accepted Answer

Shorter wavelengths have higher energy per photon.

Question 20

How many turns of the Calvin cycle are required to produce one net molecule of G3P?

Accepted Answer

Three

Photosynthesis: Mechanisms, Pigments, and the Calvin Cycle

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드