Question 1

Which of the following is the revised, balanced equation for the generation of sugar from sunlight, water, and CO2?

Accepted Answer

A)  6 CO2 + 6 H2O $\to$ C6H12O6 + O2 
B)  6 CO2 + 12 H2O $\to$  C6H12O6 + 6 O2 + 6 H2O 
C)  6 CO2 + 6 H2O $\to$ C6H12O6 + 6 O2 
D)  12 CO2 + 12 H2O $\to$  2 C6H12O6 + 2 O2 
E)  None of the above 
A)  6 CO2 + 6 H2O $\to$ C6H12O6 + O2 
B)  6 CO2 + 12 H2O $\to$  C6H12O6 + 6 O2 + 6 H2O 
C)  6 CO2 + 6 H2O $\to$ C6H12O6 + 6 O2 
D)  12 CO2 + 12 H2O $\to$  2 C6H12O6 + 2 O2 
E)  None of the above

Question 2

Heterotrophs are dependent on autotrophs for their food supply. Autotrophs can make their own food by

Accepted Answer

A)  feeding on bacteria and converting the nutrients into usable energy. 
B)  using light and simple chemicals to make reduced carbon compounds. 
C)  synthesizing it from water and CO2. 
D)  All of the above 
E)  None of the above 
A)  feeding on bacteria and converting the nutrients into usable energy. 
B)  using light and simple chemicals to make reduced carbon compounds. 
C)  synthesizing it from water and CO2. 
D)  All of the above 
E)  None of the above

Question 3

Photosynthesis and respiration are linked through the

Accepted Answer

A)  Calvin cycle. 
B)  citric acid cycle. 
C)  enzyme rubisco. 
D)  need for light. 
E)  a, b, and c 
A)  Calvin cycle. 
B)  citric acid cycle. 
C)  enzyme rubisco. 
D)  need for light. 
E)  a, b, and c

Question 4

During the light reactions of photosynthesis, the synthesis of _______ is coupled to the diffusion of protons.

Accepted Answer

The answer of During the light reactions of photosynthesis, the...

Question 5

The wavelength of X rays is shorter than the wave length of infrared rays. Which of the following is true?

Accepted Answer

A)  X rays have more energy per photon than infrared rays have. 
B)  X rays have a smaller value for Planck's constant than infrared waves have. 
C)  X rays have a different absorption spectrum than infrared waves have. 
D)  X rays and infrared waves have the same frequency. 
E)  Infrared waves are in the ground state, whereas X rays are in the excited state. 
A)  X rays have more energy per photon than infrared rays have. 
B)  X rays have a smaller value for Planck's constant than infrared waves have. 
C)  X rays have a different absorption spectrum than infrared waves have. 
D)  X rays and infrared waves have the same frequency. 
E)  Infrared waves are in the ground state, whereas X rays are in the excited state.

Question 6

Which of the following statements about the light-independent reactions of photosynthesis is not correct?

Accepted Answer

A)  The light-independent reactions refer to the pathways by which CO2 is reduced to carbohydrates. 
B)  The light-independent reactions take place in the chloroplast stroma. 
C)  ATP is consumed by light-independent reactions. 
D)  NADPH is consumed by light-independent reactions. 
E)  The light-independent reactions operate in the dark. 
A)  The light-independent reactions refer to the pathways by which CO2 is reduced to carbohydrates. 
B)  The light-independent reactions take place in the chloroplast stroma. 
C)  ATP is consumed by light-independent reactions. 
D)  NADPH is consumed by light-independent reactions. 
E)  The light-independent reactions operate in the dark.

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, and the concentration of ribulose bisphosphate (RuBP) declines. Why does the RuBP concentration decline?

Accepted Answer

A)  Ribulose bisphosphate is synthesized from glyceraldehyde 3-phosphate. 
B)  Glyceraldehyde 3-phosphate is converted to glucose. 
C)  Ribulose bisphosphate is used to synthesize 3-phosphoglycerate. 
D)  Both a and b 
E)  Both a and c 
A)  Ribulose bisphosphate is synthesized from glyceraldehyde 3-phosphate. 
B)  Glyceraldehyde 3-phosphate is converted to glucose. 
C)  Ribulose bisphosphate is used to synthesize 3-phosphoglycerate. 
D)  Both a and b 
E)  Both a and c

Question 8

The most abundant enzyme in the biosphere is _______.

Accepted Answer

rubisco (o

Question 9

The energy source for the synthesis of carbohydrates in the Calvin cycle is

Accepted Answer

A)  ATP only. 
B)  photons. 
C)  energized chlorophyll a. 
D)  NADPH + H+. 
E)  NADPH and ATP. 
A)  ATP only. 
B)  photons. 
C)  energized chlorophyll a. 
D)  NADPH + H+. 
E)  NADPH and ATP.

Question 10

In noncyclic photophosphorylation, water is used for the

Accepted Answer

A)  hydrolysis of ATP. 
B)  excitation of chlorophyll. 
C)  reduction of chlorophyll. 
D)  oxidation of NADPH. 
E)  synthesis of chlorophyll. 
A)  hydrolysis of ATP. 
B)  excitation of chlorophyll. 
C)  reduction of chlorophyll. 
D)  oxidation of NADPH. 
E)  synthesis of chlorophyll.

Question 11

During photorespiration, rubisco uses _______ as a substrate.

Accepted Answer

A)  CO2 
B)  O2 
C)  glyceraldehyde 3-phosphate 
D)  3-phosphoglycerate 
E)  NADPH 
A)  CO2 
B)  O2 
C)  glyceraldehyde 3-phosphate 
D)  3-phosphoglycerate 
E)  NADPH

Question 12

Which statement about chlorophylls is not true?

Accepted Answer

A)  Chlorophylls absorb light near both ends of the visible spectrum. 
B)  Chlorophylls can accept energy from other pigments, such as carotenoids. 
C)  Excited chlorophyll can either reduce another substance or release light energy. 
D)  Excited chlorophyll cannot be an oxidizing agent. 
E)  Chlorophylls contain magnesium. 
A)  Chlorophylls absorb light near both ends of the visible spectrum. 
B)  Chlorophylls can accept energy from other pigments, such as carotenoids. 
C)  Excited chlorophyll can either reduce another substance or release light energy. 
D)  Excited chlorophyll cannot be an oxidizing agent. 
E)  Chlorophylls contain magnesium.

Question 13

Which of the following statements about photosynthesis is false?

Accepted Answer

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 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. 
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 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.

Question 14

In addition to driving the synthesis of ATP and the reduction of NADP+ to NADPH, light stimulates the Calvin cycle by _______ and _______.

Accepted Answer

A)  decreasing the pH of the stroma; reduction of some enzymes 
B)  increasing the pH of the stroma; reduction of some enzymes 
C)  increasing the pH of the stroma; oxidation of some enzymes 
D)  decreasing the pH of the stroma; oxidation of some enzymes 
E)  None of the above 
A)  decreasing the pH of the stroma; reduction of some enzymes 
B)  increasing the pH of the stroma; reduction of some enzymes 
C)  increasing the pH of the stroma; oxidation of some enzymes 
D)  decreasing the pH of the stroma; oxidation of some enzymes 
E)  None of the above

Question 15

In chloroplasts,

Accepted Answer

A)  light leads to the flow of protons out of the thylakoids. 
B)  ATP is formed when protons flow into the thylakoid lumen. 
C)  light causes the thylakoid lumen to become less acidic than the stroma. 
D)  protons return passively to the stroma through protein channels. 
E)  proton pumping requires ATP. 
A)  light leads to the flow of protons out of the thylakoids. 
B)  ATP is formed when protons flow into the thylakoid lumen. 
C)  light causes the thylakoid lumen to become less acidic than the stroma. 
D)  protons return passively to the stroma through protein channels. 
E)  proton pumping requires ATP.

Question 16

In noncyclic photophosphorylation, electrons from _______ replenish chlorophyll molecules that have given up electrons.

Accepted Answer

A)  CO2 
B)  water 
C)  NADPH + H+ 
D)  O2 gas 
E)  None of the above 
A)  CO2 
B)  water 
C)  NADPH + H+ 
D)  O2 gas 
E)  None of the above

Question 17

The photosynthetic pigment chlorophyll a absorbs

Accepted Answer

A)  infrared light. 
B)  orange-red and blue light. 
C)  X rays. 
D)  gamma rays. 
E)  white light. 
A)  infrared light. 
B)  orange-red and blue light. 
C)  X rays. 
D)  gamma rays. 
E)  white light.

Question 18

Plants consume CO2 and give off O2. How is this possible if plants must also undergo cellular respiration?

Accepted Answer

Plant cells undergo cellular respiration

Question 19

When a photon interacts with molecules such as those within chloroplasts, the photons may

Accepted Answer

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)  All of the above 
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)  All of the above

Question 20

Which of the following scientific tools "cracked" the Calvin-Benson cycle?

Accepted Answer

A)  Radioisotopes 
B)  Paper chromatography 
C)  Crystallography 
D)  Centrifugation and electron microscopy 
E)  Both a and b 
A)  Radioisotopes 
B)  Paper chromatography 
C)  Crystallography 
D)  Centrifugation and electron microscopy 
E)  Both a and b

Exam 10: Photosynthesis: Energy From Sunlight

Which of the following is the revised, balanced equation for the generation of sugar from sunlight, water, and CO2?

Heterotrophs are dependent on autotrophs for their food supply. Autotrophs can make their own food by

Photosynthesis and respiration are linked through the

During the light reactions of photosynthesis, the synthesis of _______ is coupled to the diffusion of protons.

The wavelength of X rays is shorter than the wave length of infrared rays. Which of the following is true?

Which of the following statements about the light-independent reactions of photosynthesis is not correct?

The most abundant enzyme in the biosphere is _______.

The energy source for the synthesis of carbohydrates in the Calvin cycle is

In noncyclic photophosphorylation, water is used for the

During photorespiration, rubisco uses _______ as a substrate.

Which statement about chlorophylls is not true?

Which of the following statements about photosynthesis is false?

In addition to driving the synthesis of ATP and the reduction of NADP+ to NADPH, light stimulates the Calvin cycle by _______ and _______.

In chloroplasts,

In noncyclic photophosphorylation, electrons from _______ replenish chlorophyll molecules that have given up electrons.

The photosynthetic pigment chlorophyll a absorbs

Plants consume CO2 and give off O2. How is this possible if plants must also undergo cellular respiration?

When a photon interacts with molecules such as those within chloroplasts, the photons may

Which of the following scientific tools "cracked" the Calvin-Benson cycle?

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Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

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Pathways That Harvest Chemical Energy

The Cell Cycle and Cell Division

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Filters

Which of the following is the revised, balanced equation for the generation of sugar from sunlight, water, and CO₂?

In addition to driving the synthesis of ATP and the reduction of NADP⁺ to NADPH, light stimulates the Calvin cycle by _ and _.

Plants consume CO₂ and give off O₂. How is this possible if plants must also undergo cellular respiration?