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photosynthesis

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

 1. 
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
c.
to produce NADPH used in respiration
d.
to convert light energy to the chemical energy of PGAL
e.
to use ATP to make glucose
 
 
Use the following information to answer the questions below.

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.
 

 2. 
What did Engelmann conclude about the congregation of bacteria in the red and blue areas?
a.
Bacteria released excess carbon dioxide in these areas.
b.
Bacteria congregated in these areas due to an increase in the temperature of the red and blue light.
c.
Bacteria congregated in these areas because these areas had the most oxygen being released.
d.
Bacteria are attracted to red and blue light and thus these wavelengths are more reactive than other wavelengths.
e.
Bacteria congregated in these areas due to an increase in the temperature caused by an increase in photosynthesis.
 

 3. 
The figure below shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

chap7pracf_files/i0050000.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.
 

 4. 
What wavelength of light is most effective in driving photosynthesis?
a.
420 mm
b.
475 mm
c.
575 mm
d.
625 mm
e.
730 mm
 

 5. 
Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?
a.
the splitting of water
b.
the absorption of light energy by chlorophyll
c.
the flow of electrons from photosystem II to photosystem I
d.
the synthesis of ATP
e.
the reduction of NADP+
 

 6. 
Which of the following statements best describes the relationship between photosynthesis and respiration?
a.
Respiration is the reversal of the biochemical pathways of photosynthesis.
b.
Photosynthesis stores energy in complex organic molecules, while respiration releases it.
c.
Photosynthesis occurs only in plants and respiration occurs only in animals.
d.
ATP molecules are produced in photosynthesis and used up in respiration.
e.
Respiration is anabolic and photosynthesis is catabolic.
 

 7. 
Where is the electron transport chain found in plant cells?
a.
thylakoid membranes of chloroplasts
b.
stroma of chloroplasts
c.
inner membrane of mitochondria
d.
matrix of mitochondria
e.
cytoplasm
 
 
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
 

 8. 
synthesis of ATP by the chemiosmotic mechanism
a.
A
b.
B
c.
C
d.
D
 

 9. 
generation of proton gradients across membranes
a.
A
b.
B
c.
C
d.
D
 
 
For the following questions, compare the light reactions with the Calvin cycle of photosynthesis in plants. Use the following key:

A.
light reactions alone
B.
the Calvin cycle alone
C.
both the light reactions and the Calvin cycle
D.
neither the light reactions nor the Calvin cycle
E.
occurs in the chloroplast but is not part of photosynthesis
 

 10. 
produces molecular oxygen (O2)
a.
A
b.
B
c.
C
d.
D
e.
E
 

 11. 
produces NADH
a.
A
b.
B
c.
C
d.
D
e.
E
 

 12. 
produces three-carbon sugars
a.
A
b.
B
c.
C
d.
D
e.
E
 

 13. 
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.
 

 14. 
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they
a.
fix CO2 into organic acids during the night.
b.
fix CO2 into sugars in the bundle-sheath cells.
c.
fix CO2 into pyruvate in the mesophyll cells.
d.
use the enzyme phosphofructokinase, which outcompetes rubisco for CO2.
e.
use photosystems I and II at night.
 

 15. 
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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