Name: 
 

AP CH7


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

1. 
Plants need which of the following to carry on photosynthesis?
a.
H2O
b.
CO2
c.
O2
d.
lipid
e.
H2O and CO2.
 

2. 
The conversion of solar energy to chemical energy occurs during
a.
glycolysis.
b.
photosynthesis.
c.
respiration.
d.
fermentation.
e.
chemosynthesis.
 

3. 
The internal membrane system of the chloroplast is called a
a.
thylakoid.
b.
stroma.
c.
lamella.
d.
mitochondrion.
e.
tracheid.
 

4. 
Which of the following statements is NOT true?
a.
Photons are packages of solar energy.
b.
The longer the wavelength of light, the more energy it has.
c.
Chlorophyll absorbs energy from light.
d.
Photons with different energy levels produce different colors.
e.
Visible light is a very small portion of the electromagnetic spectrum.
 

5. 
Which of the following statements about the electromagnetic spectrum is true?
a.
Infrared energy is sufficient to produce ionization.
b.
Infrared radiation has more energy than red radiation.
c.
Visible light has more energy than ultraviolet radiation.
d.
Chlorophyll absorbs some visible wavelengths, but not all.
e.
Chloroplasts absorb all wavelengths of light equally.
 

6. 
Photosystems are mainly
a.
light-trapping molecules.
b.
enzymes for splitting water.
c.
clusters of ATP molecules.
d.
sugar assembly sites.

THE LIGHT-DEPENDENT REACTIONS
 

7. 
The photosystem with P700 is designated "I" (Roman numeral one) because
a.
it is the first to react.
b.
it is assumed to have evolved first.
c.
it is primary.
d.
a and b are correct
e.
b and c are correct
 

8. 
The cyclic pathway functions mainly to
a.
fix CO2.
b.
produce O2.
c.
make ATP.
d.
reduce NADP.
e.
split H2O.
 

9. 
In the cyclic pathway,
a.
ATP alone forms.
b.
ATP and NADPH form.
c.
oxygen is a by-product.
d.
water participates in the process.
e.
two photosystems are involved.
 

10. 
Photolysis involves
a.
the cyclic pathway of ATP formation.
b.
photosystem I.
c.
carotenoid pigments.
d.
the noncyclic pathway of ATP formation.
e.
both the cyclic pathway of ATP formation and photosystem I.
 

11. 
If P700 were replaced by a molecule that merely trapped electrons,
a.
photolysis would cease.
b.
NADPH synthesis would stop.
c.
ATP synthesis would continue.
d.
photolysis would cease and NADPH synthesis would stop.
e.
NADPH synthesis would stop and ATP synthesis would continue.
 

12. 
ATP is formed when __________ the thylakoid compartment.
a.
hydrogen ions enter
b.
electrons leave
c.
hydrogen ions leave
d.
electrons enter
e.
water is split in
 

13. 
The concept that concentration differences in H+ and electric gradients across a membrane are responsible for ATP formation is known as
a.
the chemiosmotic model.
b.
the photosystem mechanism.
c.
the process of photolysis.
d.
the electron transfer system.
e.
the cyclic pathway.
 

14. 
How many molecules of PGAL (phosphoglyceraldehyde) are used to regenerate the six molecules of RuBP (ribulose bisphosphate)?
a.
3
b.
6
c.
10
d.
12
e.
18
 

15. 
Which of the following chemicals has six carbon atoms?
a.
phosphoglycerate (PGA)
b.
ribulose bisphosphate (RuBP)
c.
phosphoglyceraldehyde (PGAL)
d.
glucose
e.
oxaloacetate
 

16. 
Plants manufacture glucose
a.
for exclusive use by animals.
b.
to function as the beginning of more complex molecules.
c.
as a by-product produced as the plant manufactures oxygen.
d.
during the process known as photorespiration.
e.
via the tricarboxylic acid cycle.
 

17. 
Which of the following chemicals has four carbon atoms?
a.
phosphoglycerate (PGA)
b.
ribulose bisphosphate (RuBP)
c.
phosphoglyceraldehyde (PGAL)
d.
glucose
e.
oxaloacetate
 

18. 
Which is a C4 plant?
a.
corn
b.
pine
c.
sugarcane
d.
crabgrass
e.
all except pine
 

19. 
The C4 pathway involves
a.
RuBP.
b.
FAD.
c.
oxaloacetate.
d.
ATP.
e.
water.
 

20. 
Which of the following would NOT be true of CAM plants?
a.
fix carbon only once
b.
live in desert environments
c.
fix carbon mostly during the day
d.
open stomata only at night
e.
grow slowly
 

Short Answer
 
 
Pathways in Photosynthesis

The processes listed below represent major chemical pathways in the photosynthetic process. Answer questions 74-78 with reference to these five processes.
a.      light-dependent reactions
b.      chemosynthetic reactions
c.      carbon dioxide fixation
d.      Calvin-Benson cycle
e.      C4 pathway
 

21. 
Refer to Pathways in Photosynthesis. In this process carbon dioxide is incorporated first into an unstable intermediate compound and then into phosphoglycerate.
 

22. 
Refer to Pathways in Photosynthesis. This yields NADPH as well as ATP.
 

23. 
Refer to Pathways in Photosynthesis. PGAL molecules are formed from the reaction of PGA molecules with ATP and NADPH in this pathway.
 
 
Noncyclic Pathway of ATP Formation

The five reactions listed below occur during the noncyclic pathway of ATP formation. Use them to answer the following questions.

a.      reduction of NADP
b.      phosphorylation of ADP
c.      photolysis of water
d.      oxidation of chlorophyll
e.      reduction of chlorophyll
 

24. 
Refer to Noncyclic Pathway of ATP Formation. The final step that occurs during noncyclic ATP formation is this.
 

25. 
Refer to Noncyclic Pathway of ATP Formation. Oxygen is produced by this process.
 



 
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