Question 1

The Calvin cycle uses _______ to produce glucose.

Accepted Answer

A)  CO2 
B)  ATP 
C)  NADPH 
D)  rubisco 
E)  All of the above 
A)  CO2 
B)  ATP 
C)  NADPH 
D)  rubisco 
E)  All of the above

Question 2

Why do plants undergo both the light reactions of photosynthesis and the Calvin cycle? Why don't they simply use the ATP produced in the light reactions of photosynthesis to drive cellular processes?

Accepted Answer

The light reactions of photosynthesis pr

Question 3

When a suspension of algae is incubated in a flask in the presence of light and CO2 and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked. This reaction stops when the algae are placed in the dark because

Accepted Answer

A)  the reaction requires CO2. 
B)  the reaction is exergonic. 
C)  the reaction requires ATP and NADPH + H+. 
D)  the reaction requires O2. 
E)  chlorophyll is not synthesized in the dark. 
A)  the reaction requires CO2. 
B)  the reaction is exergonic. 
C)  the reaction requires ATP and NADPH + H+. 
D)  the reaction requires O2. 
E)  chlorophyll is not synthesized in the dark.

Question 4

Photophosphorylation provides the Calvin-Benson cycle with

Accepted Answer

A)  protons and electrons. 
B)  CO2 and glucose. 
C)  water and photons. 
D)  light and chlorophyll. 
E)  ATP and NADPH. 
A)  protons and electrons. 
B)  CO2 and glucose. 
C)  water and photons. 
D)  light and chlorophyll. 
E)  ATP and NADPH.

Question 5

The NADPH required for the reduction of 3PG to G3P comes from

Accepted Answer

A)  the dark reactions. 
B)  the light reactions. 
C)  the synthesis of ATP. 
D)  the Calvin cycle. 
E)  oxidative phosphorylation. 
A)  the dark reactions. 
B)  the light reactions. 
C)  the synthesis of ATP. 
D)  the Calvin cycle. 
E)  oxidative phosphorylation.

Question 6

Which of the following statements about the role of chlorophyll in photosynthesis is false?

Accepted Answer

A)  Chlorophyll appears green because it reflects green light. 
B)  Most of the chlorophyll in a plant functions to gather light. 
C)  Chlorophyll is present in all photosynthetic organisms. 
D)  Most of the chlorophyll in a plant participates in an oxidation/reduction reaction. 
E)  Chlorophyll contains Mg2+. 
A)  Chlorophyll appears green because it reflects green light. 
B)  Most of the chlorophyll in a plant functions to gather light. 
C)  Chlorophyll is present in all photosynthetic organisms. 
D)  Most of the chlorophyll in a plant participates in an oxidation/reduction reaction. 
E)  Chlorophyll contains Mg2+.

Question 7

Photosynthetic organisms that can harvest light to form carbohydrates are called _______.

Accepted Answer

The answer of Photosynthetic organisms that can harvest light to...

Question 8

In cyclic electron transport,

Accepted Answer

A)  oxygen gas is released. 
B)  ATP is formed. 
C)  water donates electrons and protons. 
D)  NADPH forms. 
E)  CO2 reacts with RuBP. 
A)  oxygen gas is released. 
B)  ATP is formed. 
C)  water donates electrons and protons. 
D)  NADPH forms. 
E)  CO2 reacts with RuBP.

Question 9

Why are plants green?

Accepted Answer

The primary pigments in plants are chlor

Question 10

The NADPH required for CO2 fixation is formed

Accepted Answer

A)  by the reduction of O2. 
B)  by the hydrolysis of ATP. 
C)  during the light reactions. 
D)  in C4 plants only. 
E)  in the mitochondria. 
A)  by the reduction of O2. 
B)  by the hydrolysis of ATP. 
C)  during the light reactions. 
D)  in C4 plants only. 
E)  in the mitochondria.

Question 11

Plants that carry out crassulacean acid metabolism (CAM) differ from C4 plants in that

Accepted Answer

A)  they do not contain PEP carboxylase. 
B)  they do not carry out the Calvin cycle. 
C)  their stomates are open at night. 
D)  they do not need ATP for photosynthesis. 
E)  they do not contain rubisco. 
A)  they do not contain PEP carboxylase. 
B)  they do not carry out the Calvin cycle. 
C)  their stomates are open at night. 
D)  they do not need ATP for photosynthesis. 
E)  they do not contain rubisco.

Question 12

During CO2 fixation, CO2 combines with

Accepted Answer

A)  NADPH. 
B)  3PG. 
C)  G3P. 
D)  water. 
E)  1,5-ribulose bisphosphate. 
A)  NADPH. 
B)  3PG. 
C)  G3P. 
D)  water. 
E)  1,5-ribulose bisphosphate.

Question 13

Which statement about light is true?

Accepted Answer

A)  An absorption spectrum is a plot of biological effectiveness versus wavelength. 
B)  An absorption spectrum may be a good means of identifying a pigment. 
C)  Light need not be absorbed to produce a biological effect. 
D)  A given kind of molecule can occupy any energy level. 
E)  A pigment loses energy as it absorbs a photon. 
A)  An absorption spectrum is a plot of biological effectiveness versus wavelength. 
B)  An absorption spectrum may be a good means of identifying a pigment. 
C)  Light need not be absorbed to produce a biological effect. 
D)  A given kind of molecule can occupy any energy level. 
E)  A pigment loses energy as it absorbs a photon.

Question 14

C4 plants have _______ rates of _______ than C3 plants because the ratio of the concentrations of CO2 to that of O2 is _______ in C4 plants.

Accepted Answer

A)  lower; respiration; higher 
B)  lower; photorespiration; higher 
C)  higher; photorespiration; higher 
D)  lower; photorespiration; lower 
E)  lower; respiration; lower 
A)  lower; respiration; higher 
B)  lower; photorespiration; higher 
C)  higher; photorespiration; higher 
D)  lower; photorespiration; lower 
E)  lower; respiration; lower

Question 15

Which of the following occurs during the light-independent reactions of photosynthesis?

Accepted Answer

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 
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

Question 16

The chemiosmotic hypothesis states that the energy for the production of ATP comes from

Accepted Answer

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 
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

Question 17

The molecular structure of chlorophyll a is (different from/similar to) _______ the molecular structure of chlorophyll b.

Accepted Answer

The answer of The molecular structure of chlorophyll a is...

Question 18

When a photon is absorbed by a molecule, the photon

Accepted Answer

A)  loses its ability to generate any energy. 
B)  raises the molecule from a ground state of low energy to an excited state. 
C)  affects the molecule in ways that are not clearly understood. 
D)  causes a change in the velocity of the wavelengths. 
E)  None of the above 
A)  loses its ability to generate any energy. 
B)  raises the molecule from a ground state of low energy to an excited state. 
C)  affects the molecule in ways that are not clearly understood. 
D)  causes a change in the velocity of the wavelengths. 
E)  None of the above

Exam 10: Photosynthesis: Energy From Sunlight

The Calvin cycle uses _______ to produce glucose.

Why do plants undergo both the light reactions of photosynthesis and the Calvin cycle? Why don't they simply use the ATP produced in the light reactions of photosynthesis to drive cellular processes?

When a suspension of algae is incubated in a flask in the presence of light and CO2 and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked. This reaction stops when the algae are placed in the dark because

Photophosphorylation provides the Calvin-Benson cycle with

The NADPH required for the reduction of 3PG to G3P comes from

Which of the following statements about the role of chlorophyll in photosynthesis is false?

Photosynthetic organisms that can harvest light to form carbohydrates are called _______.

In cyclic electron transport,

Why are plants green?

The NADPH required for CO2 fixation is formed

Plants that carry out crassulacean acid metabolism (CAM) differ from C4 plants in that

During CO2 fixation, CO2 combines with

Which statement about light is true?

C4 plants have _______ rates of _______ than C3 plants because the ratio of the concentrations of CO2 to that of O2 is _______ in C4 plants.

Which of the following occurs during the light-independent reactions of photosynthesis?

The chemiosmotic hypothesis states that the energy for the production of ATP comes from

The molecular structure of chlorophyll a is (different from/similar to) _______ the molecular structure of chlorophyll b.

When a photon is absorbed by a molecule, the photon

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When a suspension of algae is incubated in a flask in the presence of light and CO₂ and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked. This reaction stops when the algae are placed in the dark because

The NADPH required for CO₂ fixation is formed

Plants that carry out crassulacean acid metabolism (CAM) differ from C₄plants in that

During CO₂ fixation, CO₂ combines with

C₄ plants have ___ rates of _ than C₃plants because the ratio of the concentrations of CO₂ to that of O₂ is _____ in C₄ plants.