AP Bio. Chapter 8
Name:___________________
1. The photosynthetic pigment chlorophyll a absorbs
a. infrared light
b. red and blue light.
c. X rays.
d. gamma rays.
e. white light.
2. Accessory pigments
a. play no role in photosynthesis.
b. transfer energy from chlorophyll to the electron transport chain.
c. absorb only in the red wavelengths.
d. allow plants to absorb visible light of intermediate wavelengths.
e. transfer electrons to NADP.
3. During cyclic photophosphorylation, the energy to produce ATP is provided by
a. heat.
b. NADPH.
c. ground-state chlorophyll.
d. the redox reactions of the electron transport chain.
e. the Calvin–Benson cycle.
4. Photophosphorylation provides the Calvin–Benson cycle with
a. protons and electrons.
b. CO2 and glucose.
c. water and photons.
d. light and chlorophyll.
e. ATP and NADPH.
5. The chlorophyll in photosystem I is reduced and returned to it's normal state by
a. water.
b. an electron from the transport chain of photosystem II.
c. two photons of light.
d. NADPH.
e. ATP.
6. The enzyme ATP synthase couples the synthesis of ATP to
a. the diffusion of protons.
b. the reduction of NADP+.
c. the excitation of chlorophyll.
d. the reduction of chlorophyll.
e. CO2 fixation.
Use the following for question 7.
A suspension of algae is incubated in a flask in the presence of both light and CO2. When it is
transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is
blocked.
7. Why does this reaction stop when the algae are placed in the dark?
a. It requires CO2.
b. It is an exergonic reaction.
c. It requires ATP and NADPH + H+.
d. It requires O2.
e. Chlorophyll is not synthesized in the dark.
8. During CO2 fixation, CO2 combines with
a. NADPH.
b. 3PG.
c. G3P.
d. water.
e. RuBP
9. The NADPH required for the reduction of 3PG to G3P comes from
a. the dark reactions.
b. the light reactions.
c. the synthesis of ATP.
d. the Calvin–Benson cycle.
e. oxidative phosphorylation.
10. During photorespiration, rubisco uses _______ as a substrate.
a. CO2
b. O2
c. glyceraldehyde 3-phosphate
d. 3-phosphoglycerate
e. NADPH
11. In both photosynthesis and respiration, protons are pumped across a membrane during
a. electron transport.
b. photolysis.
c. CO2 fixation.
d. reduction of O2.
e. glycolysis.
12. The enzyme PEP carboxylase
a. can trap CO2 even at relatively low CO2 concentrations.
b. catalyzes the synthesis of RuBP.
c. catalyzes the synthesis of 3PG.
d. is found in the chloroplasts of bundle sheath cells.
e. couples the synthesis of ATP to the diffusion of protons.
13. The O2 gas produced during photosynthesis is derived from
a. CO2.
b. glucose.
c. water.
d. carbon monoxide.
e. bicarbonate ions.
14. Photosynthesis and respiration have which of the following in common?
a. In eukaryotes, both processes reside in specialized organelles.
b. ATP synthesis in both processes relies on the chemiosmotic mechanism.
c. Both use electron transport.
d. Both require light.
e. a, b, and c
15. When a photon interacts with molecules such as those within chloroplasts, the photons may
a. bounce off the molecules, having no effect.
b. pass through the molecules, having no effect.
c. be absorbed by the molecules.
d. Both a and c
e. a, b, and c
16. In noncyclic photophosphorylation, electrons from which source replenish chlorophyll
molecules that have given up electrons?
a. CO2
b. Water
c. NADPH + H+
d. O2 gas
e. None of the above
17. Which of the following biological groups is dependent on photosynthesis for its survival?
a. Vertebrates
b. Class Mammalia
c. Fishes
d. Both a and b
e. a, b, and c
18. Which of the following occurs during the dark reactions of photosynthesis?
a. Water is converted into hydrogen and water.
b. CO2 is converted into sugars.
c. Chlorophyll acts as an enzyme.
d. Nothing occurs; the plant rests in the dark.
e. None of the above
19. When a photon is absorbed by a molecule.
a. It loses its ability to generate any energy.
b. It raises the molecule from a ground state of low energy to an excited state.
c. The exact relationship of the photon to the molecule is not clearly understood.
d. It causes a change in the velocity of the wavelengths.
e. None of the above
20. The main photosynthetic pigments in plants are
a. chlorophyll a and carotene (beta-catrotene)
b. chlorophyll x and chlorophyll y.
c. retinal pigment and accessory pigment.
d. chlorophyll a and chlorophyll b.
e. None of the above
21. The chemiosmotic hypothesis states that the energy for the production of ATP comes from
a. the transfer of phosphate from intermediate compounds.
b. the reduction of NADP.
c. a proton gradient set up across the thylakoid membrane.
d. the oxidation of CO2.
e. Both a and b
22. The revised, balanced equation for the generation of sugar from sunlight, water, and CO2 is
a. 6 CO2 + 6 H2O → C6H12O6 + O2.
b. 6 CO2 + 12 H2O → C6H12O6 + 6 O2 + 6 H2O.
c. 6 CO2 + 6 H2O →C6H12O6 + 6 O2.
d. 12 CO2 + 12 H2O →2 C6H12O6 + 2 O2.
e. None of the above
23. Which of the following statements about photosynthesis is false?
a. The water for photosynthesis in land plants comes primarily from the soil.
b. CO2 is taken in, and water and O2 are released through stomata.
c. Light is absolutely necessary for the production of O2 and carbohydrates.
d. Photosynthesis is the reverse of cellular respiration.
e. All the O2 gas produced during photosynthesis comes from water.
24. When RuBP reacts with O2,
a. it cannot react with CO2.
b. carbohydrate production increases.
c. plant growth is stimulated.
d. net carbon fixation increases by 25 percent.
e. two carbon molecules combine to form the four-carbon phosphoglycolate.
25. Photosynthesis and respiration are linked through the
a. Calvin–Benson cycle.
b. the citric acid cycle.
c. glycolysis.
d. Both a and c
e. a, b, and c