Name: 
 

Chpt 10 Online Questions



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

Which type of organism obtains energy by metabolizing molecules produced by other organisms?
a.
autotrophs
b.
heterotrophs
c.
decomposers
d.
B and C
e.
A, B, and C
 

 2. 

What is the primary function of the light reactions of photosynthesis?
a.
to produce energy-rich glucose from carbon dioxide and water
b.
to produce ATP and NADPH•H+
c.
to produce NADPH•H+ used in respiration
d.
to convert light energy to the chemical energy of PGAL
e.
to use ATP to make glucose
 

 3. 

Where does the Calvin cycle take place?
a.
stroma of the chloroplast
b.
thylakoid membrane
c.
cytoplasm surrounding the chloroplast
d.
chlorophyll molecule
e.
outer membrane of the chloroplast
 

 4. 

During photosynthesis, visible light has enough energy to
a.
force electrons closer to the nucleus.
b.
excite electrons.
c.
split a water molecule into hydrogen and oxygen.
d.
B and C only.
e.
A, B, and C.
 

 5. 

The figure below shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

chpt10_files/i0060000.jpg
a.
Green and yellow wavelengths inhibit the absorption of red and blue wavelengths.
b.
Bright sunlight destroys photosynthetic pigments.
c.
Oxygen given off during photosynthesis interferes with the absorption of light.
d.
Other pigments absorb light in addition to chlorophyll a.
e.
Aerobic bacteria take up oxygen which changes the measurement of the rate of photosynthesis.
 

 6. 

The reaction-center chlorophyll of photosystem I is known as P700 because
a.
there are 700 chlorophyll molecules in the center.
b.
this pigment is best at absorbing light with a wavelength of 700 nm.
c.
there are 700 photosystem I components to each chloroplast.
d.
it absorbs 700 photons per microsecond.
e.
the plastoquinone reflects light with a wavelength of 700 nm.
 

 7. 

All of the following are directly associated with photosystem I except
a.
harvesting of light energy by chlorophyll.
b.
receiving electrons from plastocyanin.
c.
P700 reaction-center chlorophyll.
d.
extraction of hydrogen electrons from the splitting of water.
e.
passing electrons to ferredoxin.
 

 8. 

As a research scientist, you measure the amount of ATP and NADPH•H+ consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH•H+. Where did the extra ATP molecules come from?
a.
photosystem II
b.
photosystem I
c.
cyclic electron flow
d.
noncyclic electron flow
e.
chlorophyll
 

 9. 

What does the chemiosmotic process in chloroplasts involve?
a.
establishment of a proton gradient
b.
diffusion of electrons through the thylakoid membrane
c.
reduction of water to produce ATP energy
d.
movement of water by osmosis into the thylakoid space from the stroma
e.
formation of glucose, using carbon dioxide, NADPH•H+, and ATP
 

 10. 

In a plant cell, where are the ATP synthase complexes located?
a.
thylakoid membrane
b.
plasma membrane
c.
inner mitochondrial membrane
d.
A and C
e.
A, B, and C
 
 
Refer to the choices to answer the following questions. Each choice may be used once, more than once, or not at all. Indicate whether the following events occur during

A.
photosynthesis
B.
respiration
C.
both photosynthesis and respiration
D.
neither photosynthesis nor respiration
 

 11. 

synthesis of ATP by the chemiosmotic mechanism
a.
A
b.
B
c.
C
d.
D
 

 12. 

reduction of oxygen which forms water
a.
A
b.
B
c.
C
d.
D
 

 13. 

reduction of NADP+
a.
A
b.
B
c.
C
d.
D
 

 14. 

the splitting of carbon dioxide to form oxygen gas and carbon compounds
a.
A
b.
B
c.
C
d.
D
 

 15. 

generation of proton gradients across membranes
a.
A
b.
B
c.
C
d.
D
 

 16. 

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
a.
The light reactions provide ATP and NADPH•H+ to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.
b.
The light reactions provide ATP and NADPH•H+ to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions.
c.
The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.
d.
The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split.
e.
There is no relationship between the light reactions and the Calvin cycle.
 

 17. 

One carbon dioxide molecule reacts in each "turn" of the Calvin cycle. How many turns of the cycle are required for the synthesis of one glucose molecule?
a.
1
b.
2
c.
3
d.
6
e.
12
 

 18. 

Which of the following is (are) true of the enzyme ribulose bisphosphate carboxylase?
a.
It participates in the Calvin cycle.
b.
It catalyzes a phosphorylation reaction.
c.
It has an affinity for both O2 and CO2.
d.
A and C are true.
e.
A, B, and C are true.
 
 
Use the figure below to answer the following statements.

chpt10_files/i0210000.jpg
 

 19. 

Which of the following statements is true concerning the figure?
a.
It represents cell processes involved in C4 photosynthesis.
b.
It represents the type of cell structures found in CAM plants.
c.
It represents an adaptation that minimizes photorespiration.
d.
A and C are true.
e.
A, B, and C are true.
 

 20. 

Oxygen would inhibit the CO2 fixation reactions in
a.
cell I only.
b.
cell II only.
c.
neither cell I nor cell II.
d.
both cell I and cell II.
e.
cell I during the night and cell II during the day.
 

 21. 

In which cell would you expect photorespiration?
a.
Cell I
b.
Cell II
c.
Cell I at night
d.
Cell II at night
e.
neither Cell I nor Cell II
 

 22. 

Plants that fix CO2 into organic acids at night when the stomata are open and carry out the Calvin cycle during the day when the stomata are closed are called
a.
C3 plants.
b.
C4 plants.
c.
CAM plants.
d.
B and C only.
e.
A, B, and C
 



 
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