Ch 8: Photosynthesis

Question 1

A photon of which of these colors of light would carry the most energy

Answer 1

Blue

Question 2

Which process is most directly driven by light energy?

Answer 2

Removal of electrons from chlorophyll molecules

Question 3

The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________.

Answer 3

water

Question 4

During photosynthesis, an electron transport chain transports __________.

Answer 4

electrons from photosystem II to photosystem I

Question 5

Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements about this compound is most true?

Answer 5

All of the listed responses are correct.

Question 6

What portion of the electromagnetic spectrum is most absorbed by the chlorophyll pigments in the thylakoid membranes?

Answer 6

Blue-violet and red light

Question 7

Rubisco is __________.

Answer 7

the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle

Question 8

The Calvin cycle occurs in the __________.

Answer 8

stroma

Question 9

In mechanism, photophosphorylation is most similar to __________.

Answer 9

oxidative phosphorylation in cellular respiration

Question 10

Which of the following does not occur during the Calvin cycle?

Answer 10

Release of oxygen (does: carbon fixation, oxidation NADPH, ATP consumption, CO2 Regeneration)

Question 11

How does carbon dioxide enter the leaf?

Answer 11

Through the stomata

Question 12

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

Answer 12

H2O → NADPH → Calvin cycle

Question 13

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

Answer 13

Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.

Question 14

Which of the following statements correctly describes the relationship between the light reactions and the Calvin cycle?

Answer 14

The light reactions produce ATP and NADPH, both of which are used in the Calvin cycle.

Question 15

How is photosynthesis similar in C4 plants and CAM plants?

Answer 15

Rubisco in not the enzyme that catalyzes the initial fixation of carbon.

Question 16

The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________.

Answer 16

water

Question 17

During photosynthesis in a eukaryotic cell, an electrochemical gradient is formed across the ___________.

Answer 17

thylakoid membrane

Question 18

The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why?

Answer 18

The Calvin cycle requires products only produced when the photosystems are illuminated.

Question 19

The most important role of pigments in photosynthesis is to __________.

Answer 19

capture light energy

Question 20

Rubisco is __________.

Answer 20

the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle

Question 21

Why are C4 plants more suited to hot climates than C3 plants?

Answer 21

Unlike C3 plants, they keep fixing carbon dioxide even when the concentration of carbon dioxide in the leaf is low

Question 22

Where do the electrons entering photosystem II come from?

Answer 22

Water

Question 23

Chlorophyll molecules are in which part of the chloroplast?

Answer 23

Thylakoid membranes

Question 24

You could distinguish a granum from a crista because the granum, but not the crista, would __________.

Answer 24

have photosynthetic pigments

Question 25

When chloroplast pigments absorb light, __________.

Answer 25

their electrons become excited

Question 26

In photosynthesis, plants use carbon from __________ to make sugar and other organic molecules.

Answer 26

carbon dioxide

Question 27

What is the role of NADP+ in photosynthesis?

Answer 27

It is reduced and then carries electrons to the Calvin cycle.

Question 28

What portion of the electromagnetic spectrum is most absorbed by the chlorophyll pigments in the thylakoid membranes?

Answer 28

Blue-violet and red light