Question 1

Chlorophylls and carotenoids absorb most light between ______ nm and _____ nm while reflecting most light between _____ nm.

Accepted Answer

A)  400-500; 600-700; 500-600 
B)  300-400; 600-700; 400-600 
C)  400-600; 700-800; 600-700 
D)  300-400; 700-800; 400-700 
E)  none of the above 
A)  400-500; 600-700; 500-600 
B)  300-400; 600-700; 400-600 
C)  400-600; 700-800; 600-700 
D)  300-400; 700-800; 400-700 
E)  none of the above A

Question 2

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a C4 plant compensate for the greater ATP requirement created by the C4 pathway?

Accepted Answer

A)  no changes need to be made since there is more ATP available from the light reactions than actually needed for carbon fixation 
B)  no cyclic photophosphorylation can occur 
C)  more cyclic photophosphorylation must occur 
D)  oxygen production must be increased at photosystem II 
E)  oxygen production must be decreased at photosystem II 
A)  no changes need to be made since there is more ATP available from the light reactions than actually needed for carbon fixation 
B)  no cyclic photophosphorylation can occur 
C)  more cyclic photophosphorylation must occur 
D)  oxygen production must be increased at photosystem II 
E)  oxygen production must be decreased at photosystem II C

Question 3

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a plant compensate when starch or sucrose is being synthesized?

Accepted Answer

A)  no changes need to be made since there is more ATP available from the light reactions than actually needed for carbon fixation 
B)  no cyclic photophosphorylation can occur 
C)  more cyclic photophosphorylation must occur 
D)  more NADPH must be made 
E)  none of the above 
A)  no changes need to be made since there is more ATP available from the light reactions than actually needed for carbon fixation 
B)  no cyclic photophosphorylation can occur 
C)  more cyclic photophosphorylation must occur 
D)  more NADPH must be made 
E)  none of the above C

Question 4

The carbon fixing reactions occur in the _____ .

Accepted Answer

A)  thylakoid lumen 
B)  thylakoid membrane 
C)  stroma 
D)  space between inner and outer chloroplast membrane 
E)  cytosol 
A)  thylakoid lumen 
B)  thylakoid membrane 
C)  stroma 
D)  space between inner and outer chloroplast membrane 
E)  cytosol

Question 5

Which of the following explains how a reaction center is excited?

Accepted Answer

A)  a reaction center can only be excited by direct absorption of a photon of light 
B)  excitation can occur by any of the antenna pigments in direct contact with the reaction center 
C)  excitation occurs when an antenna fluoresces so that the photon of light can be captured by a reaction center 
D)  any antenna of the light harvesting complex can transfer an electron to the reaction center by exciton transfer 
E)  transfer of heat energy from antenna to reaction center allows for excitation 
A)  a reaction center can only be excited by direct absorption of a photon of light 
B)  excitation can occur by any of the antenna pigments in direct contact with the reaction center 
C)  excitation occurs when an antenna fluoresces so that the photon of light can be captured by a reaction center 
D)  any antenna of the light harvesting complex can transfer an electron to the reaction center by exciton transfer 
E)  transfer of heat energy from antenna to reaction center allows for excitation

Question 6

Which of the following shows the correct movement of electrons in the Z-scheme of photosynthesis?

Accepted Answer

A)  H2O  $\rarr$  P700  $\rarr$  plastoquinone  $\rarr$  cytochrome b6f  $\rarr$  plastocyanin  $\rarr$  P680  $\rarr$ ferredoxin  $\rarr$  NADP+ 
B)  H2O  $\rarr$  P680 $\rarr$  plastocyanin  $\rarr$  cytochrome b6f  $\rarr$  plastoquinone  $\rarr$  P700  $\rarr$  ferredoxin  $\rarr$  NADP+ 
C)  H2O  $\rarr$  P680  $\rarr$  plastoquinone  $\rarr$ ferredoxin  $\rarr$  plastocyanin  $\rarr$ P700  $\rarr$  cytochrome b6f  $\rarr$  NADP+ 
D)  H2O  $\rarr$  P680  $\rarr$ plastoquinone $\rarr$  cytochrome b6f  $\rarr$  plastocyanin $\rarr$  P700  $\rarr$  ferredoxin  $\rarr$  NADP+ 
E)  H2O  $\rarr$  P680  $\rarr$  ferredoxin  $\rarr$  plastoquinone  $\rarr$  P700  $\rarr$  cytochrome b6f  $\rarr$  plastocyanin  $\rarr$ NADP+ 
A)  H2O  $\rarr$  P700  $\rarr$  plastoquinone  $\rarr$  cytochrome b6f  $\rarr$  plastocyanin  $\rarr$  P680  $\rarr$ ferredoxin  $\rarr$  NADP+ 
B)  H2O  $\rarr$  P680 $\rarr$  plastocyanin  $\rarr$  cytochrome b6f  $\rarr$  plastoquinone  $\rarr$  P700  $\rarr$  ferredoxin  $\rarr$  NADP+ 
C)  H2O  $\rarr$  P680  $\rarr$  plastoquinone  $\rarr$ ferredoxin  $\rarr$  plastocyanin  $\rarr$ P700  $\rarr$  cytochrome b6f  $\rarr$  NADP+ 
D)  H2O  $\rarr$  P680  $\rarr$ plastoquinone $\rarr$  cytochrome b6f  $\rarr$  plastocyanin $\rarr$  P700  $\rarr$  ferredoxin  $\rarr$  NADP+ 
E)  H2O  $\rarr$  P680  $\rarr$  ferredoxin  $\rarr$  plastoquinone  $\rarr$  P700  $\rarr$  cytochrome b6f  $\rarr$  plastocyanin  $\rarr$ NADP+

Question 7

For each molecule of oxygen generated, _____ photons are absorbed by photosystems I and II, _____ protons are transferred from stroma to lumen allowing for the production of _____ molecules of ATP.

Accepted Answer

A)  4; 8; 2 
B)  4; 12; 4 
C)  8; 8; 4 
D)  8; 12; 3 
E)  8; 16; 4 
A)  4; 8; 2 
B)  4; 12; 4 
C)  8; 8; 4 
D)  8; 12; 3 
E)  8; 16; 4

Question 8

Which of the following describes photorespiration?

Accepted Answer

A)  consumes ATP 
B)  consumes NADPH 
C)  produces CO2 
D)  consumes oxygen 
E)  all of the above 
A)  consumes ATP 
B)  consumes NADPH 
C)  produces CO2 
D)  consumes oxygen 
E)  all of the above

Question 9

Cyclic electron flow allows the chloroplast to produce a greater amount of NADPH than it would under non-cyclic electron flow.

Accepted Answer

A) True 
 B)False

Question 10

Fluorescence and exciton transfer are the two mechanisms by which an excited chlorophyll molecule can productively transfer energy; heat and photooxidation are unproductive mechanisms for energy transfer.

Accepted Answer

A) True 
 B)False

Question 11

The products of the light reactions, ATP and NADPH, are used by ______ and ______, respectively.

Accepted Answer

A)  rubisco; glyceraldehyde-3-phosphate dehydrogenase 
B)  phosphoglycerate kinase; glyceraldehyde-3-phosphate dehydrogenase 
C)  phosphoribulokinase; 3-phosphoglycerate dehydrogenase 
D)  phosphofructokinase; pyruvate dehydrogenase 
E)  phosphoglycerate kinase; 3-phosphoglycerate dehydrogenase 
A)  rubisco; glyceraldehyde-3-phosphate dehydrogenase 
B)  phosphoglycerate kinase; glyceraldehyde-3-phosphate dehydrogenase 
C)  phosphoribulokinase; 3-phosphoglycerate dehydrogenase 
D)  phosphofructokinase; pyruvate dehydrogenase 
E)  phosphoglycerate kinase; 3-phosphoglycerate dehydrogenase

Question 12

Since the reduction potential of oxygen is +0.815 V and the reaction catalyzed by P680 is highly exergonic, which of the following is most likely the reduction potential of P680*?

Accepted Answer

A)  -1.15 V 
B)  -0.815 V 
C)  +0.77 V 
D)  +0.83 V 
E)  +1.15 V 
A)  -1.15 V 
B)  -0.815 V 
C)  +0.77 V 
D)  +0.83 V 
E)  +1.15 V

Question 13

Which of the following occurs during cyclic electron flow?

Accepted Answer

A)  photosystem I absorbs light but not photosystem II 
B)  protons are pumped into the lumen by cytochrome b6f 
C)  electrons are transferred from photosystem I  $\rarr$ ferredoxin $\rarr$ cytochrome b6f  $\rarr$ plastocyanin, then back to photosystem I 
D)  there is no production of NADPH or oxygen 
E)  all of the above 
A)  photosystem I absorbs light but not photosystem II 
B)  protons are pumped into the lumen by cytochrome b6f 
C)  electrons are transferred from photosystem I  $\rarr$ ferredoxin $\rarr$ cytochrome b6f  $\rarr$ plastocyanin, then back to photosystem I 
D)  there is no production of NADPH or oxygen 
E)  all of the above

Question 14

Why is photosystem I unable to oxidize water?

Accepted Answer

A)  it cannot transfer protons to the stroma 
B)  it contains proteins that prevent oxygen from binding to it 
C)  its reduction potential is exactly equal to that of oxygen 
D)  it is a very good reducing agent 
E)  it is not a strong enough oxidizing agent 
A)  it cannot transfer protons to the stroma 
B)  it contains proteins that prevent oxygen from binding to it 
C)  its reduction potential is exactly equal to that of oxygen 
D)  it is a very good reducing agent 
E)  it is not a strong enough oxidizing agent

Question 15

What part of the chloroplast is the site of the energy-transducing reactions of photosynthesis?

Accepted Answer

A)  chloroplast outer membrane 
B)  chloroplast inner membrane 
C)  stroma 
D)  thylakoid lumen 
E)  thylakoid membrane 
A)  chloroplast outer membrane 
B)  chloroplast inner membrane 
C)  stroma 
D)  thylakoid lumen 
E)  thylakoid membrane

Question 16

What organelle is responsible for photosynthesis?

Accepted Answer

A)  Golgi apparatus 
B)  chloroplast 
C)  endoplasmic reticulum 
D)  peroxisome 
E)  glyoxysome 
A)  Golgi apparatus 
B)  chloroplast 
C)  endoplasmic reticulum 
D)  peroxisome 
E)  glyoxysome

Question 17

The P680 of photosystem II is composed of _____.

Accepted Answer

A)  two chlorophylls 
B)  two carotenoids 
C)  one chlorophyll and one phycocyanin 
D)  one chlorophyll and one carotenoid 
E)  one carotenoid and one phycocyanin 
A)  two chlorophylls 
B)  two carotenoids 
C)  one chlorophyll and one phycocyanin 
D)  one chlorophyll and one carotenoid 
E)  one carotenoid and one phycocyanin

Question 18

What is an assembly of antenna pigments?

Accepted Answer

A)  thylakoid 
B)  granum 
C)  light-harvesting complex 
D)  reaction center 
E)  lamella 
A)  thylakoid 
B)  granum 
C)  light-harvesting complex 
D)  reaction center 
E)  lamella

Chlorophylls and carotenoids absorb most light between ____ nm and _ nm while reflecting most light between ___ nm.

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a C₄ plant compensate for the greater ATP requirement created by the C₄ pathway?

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a plant compensate when starch or sucrose is being synthesized?

The carbon fixing reactions occur in the _____ .

Which of the following explains how a reaction center is excited?

Which of the following shows the correct movement of electrons in the Z-scheme of photosynthesis?

For each molecule of oxygen generated, ___ photons are absorbed by photosystems I and II, _ protons are transferred from stroma to lumen allowing for the production of ___ molecules of ATP.

Which of the following describes photorespiration?

Cyclic electron flow allows the chloroplast to produce a greater amount of NADPH than it would under non-cyclic electron flow.

Fluorescence and exciton transfer are the two mechanisms by which an excited chlorophyll molecule can productively transfer energy; heat and photooxidation are unproductive mechanisms for energy transfer.

The products of the light reactions, ATP and NADPH, are used by and , respectively.

Since the reduction potential of oxygen is +0.815 V and the reaction catalyzed by P680 is highly exergonic, which of the following is most likely the reduction potential of P680*?

Which of the following occurs during cyclic electron flow?

Why is photosystem I unable to oxidize water?

What part of the chloroplast is the site of the energy-transducing reactions of photosynthesis?

What organelle is responsible for photosynthesis?

The P680 of photosystem II is composed of _____.

What is an assembly of antenna pigments?

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Exam 16: Photosynthesis

Chlorophylls and carotenoids absorb most light between ______ nm and _____ nm while reflecting most light between _____ nm.

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a C4 plant compensate for the greater ATP requirement created by the C4 pathway?

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a plant compensate when starch or sucrose is being synthesized?

The carbon fixing reactions occur in the _____ .

Which of the following explains how a reaction center is excited?

Which of the following shows the correct movement of electrons in the Z-scheme of photosynthesis?

For each molecule of oxygen generated, _____ photons are absorbed by photosystems I and II, _____ protons are transferred from stroma to lumen allowing for the production of _____ molecules of ATP.

Which of the following describes photorespiration?

Cyclic electron flow allows the chloroplast to produce a greater amount of NADPH than it would under non-cyclic electron flow.

Fluorescence and exciton transfer are the two mechanisms by which an excited chlorophyll molecule can productively transfer energy; heat and photooxidation are unproductive mechanisms for energy transfer.

The products of the light reactions, ATP and NADPH, are used by ______ and ______, respectively.

Since the reduction potential of oxygen is +0.815 V and the reaction catalyzed by P680 is highly exergonic, which of the following is most likely the reduction potential of P680*?

Which of the following occurs during cyclic electron flow?

Why is photosystem I unable to oxidize water?

What part of the chloroplast is the site of the energy-transducing reactions of photosynthesis?

What organelle is responsible for photosynthesis?

The P680 of photosystem II is composed of _____.

What is an assembly of antenna pigments?

The Chemical Basis of Life

Aqueous Chemistry

Nucleic Acid Structure and Function

Protein Structure

Protein Function

How Enzymes Work

Enzyme Kinetics and Inhibition

Lipids and Membranes

Membrane Transport

Signaling

Carbohydrates

Metabolism and Bioenergetics

Glucose Metabolism

The Citric Acid Cycle

Oxidative Phosphorylation

Lipid Metabolism

Nitrogen Metabolism

Regulation of Mammalian Fuel Metabolism

DNA Replication and Repair

Transcription and RNA

Protein Synthesis

Filters

Chlorophylls and carotenoids absorb most light between ____ nm and _ nm while reflecting most light between ___ nm.

The Z-scheme of photosynthesis produces a 3:2 ratio of ATP:NADPH. How does a C₄ plant compensate for the greater ATP requirement created by the C₄ pathway?

For each molecule of oxygen generated, ___ photons are absorbed by photosystems I and II, _ protons are transferred from stroma to lumen allowing for the production of ___ molecules of ATP.

The products of the light reactions, ATP and NADPH, are used by and , respectively.