ch 8 bio study module Flashcards


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1

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

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

2

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

thylakoid membrane

3

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

have photosynthetic pigments

4

The Calvin cycle occurs in the __________.

stroma

5

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

H2O → NADPH → Calvin cycle

6

During photosynthesis, an electron transport chain transports __________.

electrons from photosystem II to photosystem I

7

In mechanism, photophosphorylation is most similar to __________.

oxidative phosphorylation in cellular respiration

8

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

carbon dioxide

9

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

  • It is produced from glucose during glycolysis.
  • It is a three-carbon sugar.
  • All of the listed responses are correct.
  • For every three molecules of CO2, six molecules of G3P are formed but only one molecule exits the cycle to be used by the plant cell.
  • For every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP.

10

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

Blue

11

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

Release of oxygen

12

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

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

13

Chlorophyll molecules are in which part of the chloroplast?

Thylakoid membranes

14

What is the role of NADP+ in photosynthesis?

It is reduced and then carries electrons to the Calvin cycle

15

When chloroplast pigments absorb light, __________.

their electrons become excited

16

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

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

17

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

water

18

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

Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2and other nutrients that are inorganic.

19

Rubisco is __________.

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

20

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

capture light energy

21

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

Blue-violet and red light

22

Which process is most directly driven by light energy?

Removal of electrons from chlorophyll molecules

23

How does carbon dioxide enter the leaf?

Through the stomata

24

Where do the electrons entering photosystem II come from?

Water

25

How is photosynthesis similar in C4 plants and CAM plants?

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