P HOTOSYNTHESIS
P RACTICE M ULTIPLE C HOICE Q UESTIONS
1) Which one of the following is true?
A) Cellular respiration occurs in mitochondria and in chloroplasts.
B) Photosynthesis occurs in chloroplasts and cellular respiration occurs in mitochondria.
C) Photosynthesis occurs in mitochondria and in chloroplasts.
D) Photosynthesis occurs in mitochondria and cellular respiration occurs in chloroplasts.
E) Neither cellular respiration nor photosynthesis occurs in mitochondria and in chloroplasts.
2) Respiration _____, and cellular respiration ______.
A) uses glucose . . . produces glucose
B) produces glucose . . . produces oxygen
C) is gas exchange . . . produces ATP
D) produces ATP . . . is gas exchange
E) produces glucose . . . is gas exchange
3) The summary equation for photosynthesis is
A) CO
2
+ H
2
O → C
6
H
12
O
6
+ O
2
+ ATP + Heat
B) C
6
H
12
O
6
+ O
2
→ CO
2
+ H
2
O + ATP + Heat
C) CO
2
+ H
2
O → C
6
H
12
O
6
+ O
2
D) C
6
H
12
O
6
 CO
2
+ Ethyl alcohol + ATP + Heat
4) Chloroplasts contain disk-like membranous sacs arranged in stacks called
A) cristae.
B) thylakoids.
C) vacuoles.
D) stroma.
E) grana.
5) The oxygen released into the air as a product of photosynthesis comes from
B) chlorophyll.
C) carbon dioxide.
D) water.
E) None of the choices are correct.
6) In the chloroplast, sugars are made in a compartment that is filled with a thick fluid called the
A) matrix.
B) mesophyll.
C) stomata.
D) thylakoid.
E) stroma. (G3P will leave the calvin cycle and turn into a carbohydrate in the stroma)
7) Where is chlorophyll found in a plant cell?
A) cytoplasm
B) thylakoid membranes
C) stroma
D) matrix
E) cristae
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8) Which of the following is true concerning the role of redox reactions in photosynthesis and cellular respiration?
A) In photosynthesis, carbon dioxide is oxidized to form sugar while in respiration, sugar is reduced to form carbon dioxide.
B) Photosynthesis involves only oxidations while respiration involves only reductions.
C) Photosynthesis involves only reductions while respiration involves only oxidations.
D) In photosynthesis, carbon dioxide is reduced to form sugar while in respiration, sugar is oxidized to form carbon dioxide.
E) None of the choices are true.
9) What is the source of energy that provides the boost for electrons during photosynthesis?
A) ATP
B) light
C) cellular respiration
D) electromagnetism
E) None of the choices are correct.
10) The light reactions occur in the _____ while the Calvin cycle occurs in the ______
A) stroma . . . thylakoid membranes
B) cytoplasm . . . stroma
C) thylakoid membranes . . . stroma
D) cytoplasm . . . thylakoid membrane
E) stroma . . . nucleus
11) Which of the following are produced during the light reactions of photosynthesis?
A) ADP, NADP+, O
2
B) glucose, ADP, NAD+
C) ATP, NADPH, CO
2
D) glucose, ADP, NADP+, CO
2
E) ATP, NADPH, O
2
12) Which of the following are produced during the Calvin cycle?
A) glucose, ADP, NADP+
B) ATP, NADPH, O
2
C) ATP, NADPH, CO
2
D) glucose, ADP, NADP+, CO
2
E) ADP, NADP+ , O
2
13) Carbon fixation
A) occurs when carbon and oxygen from CO
2
are incorporated into an organic molecule.
B) powers the process of glucose synthesis by supplying the cell with ATP.
C) occurs during the light reactions.
D) uses noncyclic electron flow to capture energy in glucose.
E) provides the cell with a supply of NADPH molecules.
14) The Calvin cycle involves all of the following except:
A) addition of electrons and protons to carbon.
B) formation of waste products in the form of CO
2
C) reduction of carbon.
D) carbon fixation.
E) regeneration of NADP+.
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15) Why are (most) plants green?
A) Chlorophyll a reflects green light.
B) Chlorophyll b primarily uses green light as the source of energy for photosynthesis.
C) Green helps plants blend into their environment as a sort of camouflage.
D) Chlorophyll a absorbs green light.
E) All photosynthetic pigments are colored green.
16) Of the following wavelengths of light, which would you expect to be least absorbed by chlorophyll a?
A) blue
B) yellow
C) green (green light is not absorbed but reflected)
D) red
17) When a pigment molecule absorbs a photon, one of its electrons____
A) gains energy.
B) becomes excited.
C) is put into an unstable state.
D) is raised from the ground state.
E) All of the choices are correct.
18) Clusters of light-gathering antenna pigments in a photosystem__
A) absorb electrons.
B) do not absorb photons.
C) pass energy to the reaction center.
D) are found in the roots of plants.
E) break down H
2
O.
19) As a result of the cascade of electrons down the electron transport chains of the light reactions,
A) NADPH is reduced to NADP+
B) NADP+is oxidized to NADPH.
C) water is formed.
D) NADPH is oxidized to NADP+
E) NADP+ is reduced to NADPH.
20) The electrons lost from the reaction center of photosystem I are replaced by electrons from
A) ATP.
B) CO
2
C) H
2
O
D) the top of the electron transport chain. (they are replaced by the electrons that come from photosystem II)
E) the bottom of the electron transport chain.
21) In photosynthesis, the chemiosmotic production of ATP
A) requires oxygen.
B) is analogous to the production of ATP in mitochondria.
C) requires the input of NADPH.
D) is done by the Calvin cycle.
E) All of the choices are correct.
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22) Mitochondria transfer ___ energy from ___ to ATP; chloroplasts transform ___ energy into the chemical energy of ATP.
A) food . . . light . . . chemical
B) food . . . light . . . nuclear
C) chemical . . . food . . . light
D) nuclear . . . light . . . food
E) light . . . food . . . kinetic
23) ATP and NADPH
A) play a role in glucose synthesis by plants.
B) are inputs to the photosystems.
C) production is associated with events taking place on the inner mitochondrial membrane.
D) are products of the Calvin cycle.
E) All of the choices are correct.
24) The electrons lost from the reaction center of photosystem II are replaced by electrons from
A) CO
2
B) NADPH.
C) photosystem I.
D) H
2
O.
E) ATP.
25) Photosystem II
A) does not have a reaction center.
B) is reduced by NADPH.
C) passes electrons to photosystem I.
D) has P700 at its reaction center.
E) All of the choices are correct.
26) Photophosphorylation differs from oxidative phosphorylation in that
A) regeneration of ATP is driven by a flow of protons through an ATP synthase.
B) the final electron acceptor is NADP+ and not oxygen.
C) it involves an electron transport chain.
D) energy is stored in the form of a proton concentration difference.
E) its enzymes are membrane-bound.
27) In photophosphorylation, energy from electron flow is used to transport ______ from the ______to the thylakoid compartment, generating a concentration gradient of __________.
A) H+. . . grana . . . electrons
B) electrons . . . stroma . . . H+
C) H+. . . stroma . . . ATP
D) H+ to power of ((+) ) . . . stroma . . . H+ (this is the best possible answer, but it is a little ambiguous due to the first option)
E) electrons . . . grana . . . H+
28) Plant cells
A) lack mitochondria and chloroplasts.
B) have mitochondria and chloroplasts.
C) have mitochondria but do not have chloroplasts.
D) lack mitochondria but have chloroplasts.
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