Question 1

In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

Accepted Answer

A)   the stroma to the photosystem II.
B)   the matrix to the stroma.
C)   the stroma to the thylakoid space.
D)   the intermembrane space to the matrix.
E)   the thylakoid space to the stroma.

Question 2

In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma. Therefore, the catalytic "knobs" of ATP synthase would be located

Accepted Answer

A)   on the side facing the thylakoid space.
B)   on the ATP molecules themselves.
C)   on the pigment molecules of photosystem I and photosystem II.
D)   on the stromal side of the membrane.
E)   built into the center of the thylakoid stack (granum) .

Question 3

A gardener is concerned that her greenhouse is getting too hot from too much light, and seeks to shade her plants with colored translucent plastic sheets. What color should she use to reduce overall light energy, but still maximize plant growth?

Accepted Answer

A)   green
B)   blue
C)   yellow
D)   orange
E)   any color will work equally well B

Question 4

Why are C₄ plants able to photosynthesize with no apparent photorespiration?

Accepted Answer

A)   They do not participate in the Calvin cycle.
B)   They use PEP carboxylase to initially fix CO₂.
C)   They are adapted to cold, wet climates.
D)   They conserve water more efficiently.
E)   They exclude oxygen from their tissues.

Question 5

In the process of carbon fixation, RuBP attaches a CO₂ to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate (G3P) , what more needs to happen to complete the Calvin cycle?

Accepted Answer

A)   addition of a pair of electrons from NADPH
B)   inactivation of RuBP carboxylase enzyme
C)   regeneration of ATP from ADP
D)   regeneration of RuBP
E)   regeneration of NADP⁺ D

Question 6

Figure 10.1
-Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Accepted Answer

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.

Question 7

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?

Accepted Answer

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⁺

Question 8

The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

Accepted Answer

A)   photosynthesis.
B)   respiration.
C)   both photosynthesis and respiration.
D)   neither photosynthesis nor respiration.
E)   photorespiration.

Question 9

In a plant leaf, the reactions that produce NADH occur in

Accepted Answer

A)   the 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)   the chloroplast, but is not part of photosynthesis.

Question 10

In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (¹⁴C) dioxide as a metabolic tracer. The ¹⁴C is incorporated first into oxaloacetate. The plant is best characterized as a

Accepted Answer

A)   C₄ plant.
B)   C₃ plant.
C)   CAM plant.
D)   heterotroph.
E)   chemoautotroph.

Question 11

The reactions that produce molecular oxygen (O₂) take place in

Accepted Answer

A)   the 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)   the chloroplast, but are not part of photosynthesis.

Question 12

Compared to C₃ plants, C₄ plants

Accepted Answer

A)   can continue to fix CO₂ even at relatively low CO₂ concentrations and high oxygen concentrations.
B)   have higher rates of photorespiration.
C)   do not use rubisco for carbon fixation.
D)   grow better under cool, moist conditions.
E)   make a four-carbon compound, oxaloacetate, which is then delivered to the citric acid cycle in mitochondria.

Question 13

In photosynthetic cells, synthesis of ATP by the chemiosmotic mechanism occurs during

Accepted Answer

A)   photosynthesis only.
B)   respiration only.
C)   both photosynthesis and respiration.
D)   neither photosynthesis nor respiration.
E)   photorespiration only.

Question 14

If the power fails and the lights go dark, what will happen to CO₂ levels?

Accepted Answer

A)   CO₂ will rise as a result of both animal and plant respiration.
B)   CO₂ will rise as a result of animal respiration only.
C)   CO₂ will remain balanced because plants will continue to fix CO₂ in the dark.
D)   CO₂ will fall because plants will increase CO₂ fixation.
E)   CO₂ will fall because plants will cease to respire in the dark.

Question 15

In C₃ photosynthesis, the reactions that require ATP take place in

Accepted Answer

A)   the 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)   the chloroplast, but is not part of photosynthesis.

Question 16

Where does the Calvin cycle take place?

Accepted Answer

A)   stroma of the chloroplast
B)   thylakoid membrane
C)   cytoplasm surrounding the chloroplast
D)   interior of the thylakoid (thylakoid space) 
E)   outer membrane of the chloroplast

Question 17

Which statement describes the functioning of photosystem II?

Accepted Answer

A)   Light energy excites electrons in the thylakoid membrane electron transport chain.
B)   Photons are passed along to a reaction-center chlorophyll.
C)   The P680 chlorophyll donates a pair of protons to NADP⁺, which is thus converted to NADPH.
D)   The electron vacancies in P680⁺ are filled by electrons derived from water.
E)   The splitting of water yields molecular carbon dioxide as a by-product. D

Question 18

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

Accepted Answer

A)   Only heterotrophs require chemical compounds from the environment.
B)   Cellular respiration is unique to heterotrophs.
C)   Only heterotrophs have mitochondria.
D)   Autotrophs, but not heterotrophs, can nourish themselves beginning with CO₂ and other nutrients that are inorganic.
E)   Only heterotrophs require oxygen.

Question 19

In mechanism, photophosphorylation is most similar to

Accepted Answer

A)   substrate-level phosphorylation in glycolysis.
B)   oxidative phosphorylation in cellular respiration.
C)   the Calvin cycle.
D)   carbon fixation.
E)   reduction of NADP⁺.

Question 20

Plants photosynthesize only in the light. Plants respire

Accepted Answer

A)   in the dark only.
B)   in the light only.
C)   both in light and dark.
D)   never-they get their ATP from photophosphorylation.
E)   only when excessive light energy induces photorespiration.

Exam 10: Photosynthesis

In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

Correct AnswerverifiedShow Answer

In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma. Therefore, the catalytic "knobs" of ATP synthase would be located

Correct AnswerverifiedShow Answer

A gardener is concerned that her greenhouse is getting too hot from too much light, and seeks to shade her plants with colored translucent plastic sheets. What color should she use to reduce overall light energy, but still maximize plant growth?

Correct AnswerverifiedB

Why are C₄ plants able to photosynthesize with no apparent photorespiration?

Correct AnswerverifiedShow Answer

In the process of carbon fixation, RuBP attaches a CO₂ to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate (G3P) , what more needs to happen to complete the Calvin cycle?

Correct AnswerverifiedD

Figure 10.1 -Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

Correct AnswerverifiedShow Answer

In a plant leaf, the reactions that produce NADH occur in

Correct AnswerverifiedShow Answer

In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (¹⁴C) dioxide as a metabolic tracer. The ¹⁴C is incorporated first into oxaloacetate. The plant is best characterized as a

Correct AnswerverifiedShow Answer

The reactions that produce molecular oxygen (O₂) take place in

Correct AnswerverifiedShow Answer

Compared to C₃ plants, C₄ plants

Correct AnswerverifiedShow Answer

In photosynthetic cells, synthesis of ATP by the chemiosmotic mechanism occurs during

Correct AnswerverifiedShow Answer

If the power fails and the lights go dark, what will happen to CO₂ levels?

Correct AnswerverifiedShow Answer

In C₃ photosynthesis, the reactions that require ATP take place in

Correct AnswerverifiedShow Answer

Where does the Calvin cycle take place?

Correct AnswerverifiedShow Answer

Which statement describes the functioning of photosystem II?

Correct AnswerverifiedD

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

Correct AnswerverifiedShow Answer

In mechanism, photophosphorylation is most similar to

Correct AnswerverifiedShow Answer

Plants photosynthesize only in the light. Plants respire

Correct AnswerverifiedShow Answer

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D

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D

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