Chapter 7

Question 1

What is the name given to organisms that can make their own food and sustain themselves without consuming organic molecules derived from other organisms

Answer 1

autotrophs

Question 2

Cyanobacteria and algae are

Answer 2

photoautotrophs

Question 3

In most green plants, chloroplasts are

Answer 3

concentrated in a zone of leaf tissue called the mesophyll

Question 4

In the chloroplast, sugars are made in a compartment that is filled with a thick fluid called the

Answer 4

stroma

Question 5

What are stacks of flattened sacs that contain the pigment chlorophyll called

Answer 5

Thylakoids

Question 6

What is the fluid-filled space that contains enzymes for the light-independent reactions called

Answer 6

Stroma

Question 7

Which of the following statements about the light reactions of photosynthesis is FALSE?
A) Protons (H+) are pumped into the thylakoid space
B) Water is formed from electrons, protons (H+), and oxygen
C) A proton (H+) gradient across the thylakoid membrane is used to form ATP from ADP and Pi
D) Electrons are added to NADP+ to form NADPH

Answer 7

B, Water is formed from electrons, protons (H+), and oxygen

Question 8

Chlorophyll is important in the

Answer 8

absorption of light energy

Question 9

During photosynthesis, carbon dioxide is used to make sugars in the

Answer 9

Calvin cycle

Question 10

Clusters of light-gathering pigments in a photosystem

Answer 10

pass energy to the reaction center

Question 11

All of the following are true about the thylakoid membrane EXCEPT that it
A) is composed of lipids and proteins
B) contains photosystems I and II
C) is the site of the Calvin cycle
D) is where chlorophyll molecules are located

Answer 11

C, is the site of the Calvin cycle

Question 12

The electron transport chains of the light reactions

Answer 12

shuttle electrons from photosystem II to photosystem I

Question 13

The oxygen that is released as O2 during photosynthesis came from _______ molecules

Answer 13

water

Question 14

During what stage of photosynthesis is O2 produced

Answer 14

the light-dependent reactions involving photosystems I and II

Question 15

Which of the following are produced during the light reactions of photosynthesis
A) ADP, NADP+, O2
B) ATP, NADPH, O2
C) glucose, ADP, NADP+
D) glucose, ADP, NADP+, CO2
E) all of these

Answer 15

B, ATP, NADPH, O2

Question 16

Put the following steps of the light reactions in the correct order
1) light excited an electron from photosystem I
2) Light excites an electron from photosystem II
3) Electrons reduce NADP+ to NADPH
4) electrons pass through an electron transport chain, which generates a H+ gradient used to make ATP

Answer 16

2,4,1,3

Question 17

What energy-rich organic compound is produced as a result of the Calvin cycle

Answer 17

glucose

Question 18

Which of the following statements comparing photosynthesis and cellular respiration is FALSE
A) photosynthesis produces O2; cellular respiration produces CO2
B) ATP is not produced during photosynthesis; it is produced only during cellular respiration
C) photosynthesis consumes CO2; cellular respiration consumes O2
D) photosynthesis is ultimately powered by light energy and cellular respiration by the chemical energy in organic molecules

Answer 18

B, ATP is not produced during photosynthesis; it is produced only during cellular respiration

Question 19

Which of the following colors contributes the LEAST energy to photosynthesis
A) orange
B) none of these
C) green
D) blue
E) red

Answer 19

C, green