Question 1

Cyclic electron transport

Accepted Answer

A)  involves photosystem II. 
B)  results in the formation of NADPH. 
C)  is coupled to proton uptake into the thylakoid lumen. 
D)  requires the oxidation of water. 
E)  does not use the electron transport chain between the two photosystems. 
A)  involves photosystem II. 
B)  results in the formation of NADPH. 
C)  is coupled to proton uptake into the thylakoid lumen. 
D)  requires the oxidation of water. 
E)  does not use the electron transport chain between the two photosystems.

Question 2

In plants, the reactions of glycolysis occur

Accepted Answer

A)  in C3 plants only. 
B)  in the mitochondria. 
C)  in the chloroplasts. 
D)  only in the presence of light. 
E)  in the cytosol. 
A)  in C3 plants only. 
B)  in the mitochondria. 
C)  in the chloroplasts. 
D)  only in the presence of light. 
E)  in the cytosol.

Question 3

The level of atmospheric CO2 has varied considerably over the years. Currently, the level of atmospheric CO2

Accepted Answer

A)  is four times what is was during the time of the dinosaurs. 
B)  favors C4 plants under hot conditions. 
C)  has resulted in maximum CO2 fixation by rubisco. 
D)  is decreasing. 
E)  prevents the occurrence of photorespiration. 
A)  is four times what is was during the time of the dinosaurs. 
B)  favors C4 plants under hot conditions. 
C)  has resulted in maximum CO2 fixation by rubisco. 
D)  is decreasing. 
E)  prevents the occurrence of photorespiration.

Question 4

When CO2 is added to RuBP, the first stable product synthesized is

Accepted Answer

A)  pyruvate. 
B)  ribulose 1,5-bisphosphate. 
C)  3PG. 
D)  ATP. 
E)  glyceraldehyde 3-phosphate (G3P). 
A)  pyruvate. 
B)  ribulose 1,5-bisphosphate. 
C)  3PG. 
D)  ATP. 
E)  glyceraldehyde 3-phosphate (G3P).

Question 5

Compared to long-wavelength photons, short-wavelength photons have

Accepted Answer

A)  an insignificant amount of energy. 
B)  more energy. 
C)  energy not available to plant cells. 
D)  a ladder of energy. 
E)  an equal amount of energy. 
A)  an insignificant amount of energy. 
B)  more energy. 
C)  energy not available to plant cells. 
D)  a ladder of energy. 
E)  an equal amount of energy.

Question 6

Which of the following statements regarding the relationship between photosynthesis and cellular respiration in plants is true?

Accepted Answer

A)  Photosynthesis occurs in specialized photosynthetic cells. 
B)  Cellular respiration occurs in specialized respiratory cells. 
C)  Cellular respiration and photosynthesis can occur in the same cell. 
D)  Photosynthesis is limited to specialized plant cells and cellular respiration does not occur in plant cells. 
E)  Both a and c 
A)  Photosynthesis occurs in specialized photosynthetic cells. 
B)  Cellular respiration occurs in specialized respiratory cells. 
C)  Cellular respiration and photosynthesis can occur in the same cell. 
D)  Photosynthesis is limited to specialized plant cells and cellular respiration does not occur in plant cells. 
E)  Both a and c

Question 7

Refer to the diagram below. The Ruben and Kamen experiments tracing isotopes of oxygen through the process of photosynthesis proved that

Accepted Answer

A)  all the oxygen gas produced during photosynthesis comes from water. 
B)  CO2 is the source of the oxygen released during photosynthesis. 
C)  the oxygen released by water is incorporated into glucose. 
D)  oxygen is needed to made rubisco. 
E)  NADPH is made during the Calvin cycle. 
A)  all the oxygen gas produced during photosynthesis comes from water. 
B)  CO2 is the source of the oxygen released during photosynthesis. 
C)  the oxygen released by water is incorporated into glucose. 
D)  oxygen is needed to made rubisco. 
E)  NADPH is made during the Calvin cycle.

Question 8

Rubisco has both carboxylase and oxygenase activities. These processes compete with each other. What determines which function the enzyme has? What conditions favor photorespiration? What conditions favor photosynthesis?

Accepted Answer

Whether rubisco acts as a carboxylase or

Question 9

Photorespiration

Accepted Answer

A)  results in CO2 fixation. 
B)  uses ATP and NADPH produced in the light reactions. 
C)  generates a proton gradient. 
D)  results in the synthesis of glucose. 
E)  All of the above 
A)  results in CO2 fixation. 
B)  uses ATP and NADPH produced in the light reactions. 
C)  generates a proton gradient. 
D)  results in the synthesis of glucose. 
E)  All of the above

Question 10

The enzyme rubisco is found in

Accepted Answer

A)  chloroplasts. 
B)  mitochondria. 
C)  the cytoplasm. 
D)  the nucleus. 
E)  yeast. 
A)  chloroplasts. 
B)  mitochondria. 
C)  the cytoplasm. 
D)  the nucleus. 
E)  yeast.

Question 11

Plants are green because

Accepted Answer

A)  chlorophylls absorb blue and orange-red wavelengths of light and reflect green light. 
B)  chloroplasts transmit green light. 
C)  energized chlorophyll a emits green light. 
D)  plants do not possess green pigment. 
E)  chlorophylls absorb green light. 
A)  chlorophylls absorb blue and orange-red wavelengths of light and reflect green light. 
B)  chloroplasts transmit green light. 
C)  energized chlorophyll a emits green light. 
D)  plants do not possess green pigment. 
E)  chlorophylls absorb green light.

Question 12

Cyclic and noncyclic electron flow are used in plants to

Accepted Answer

A)  meet the ATP demands of the Calvin cycle. 
B)  produce excess NADPH + H+. 
C)  synthesize proportional amounts of ATP and NADPH + H+ in the chloroplast. 
D)  consume the products of the Calvin cycle. 
E)  produce O2 for the atmosphere. 
A)  meet the ATP demands of the Calvin cycle. 
B)  produce excess NADPH + H+. 
C)  synthesize proportional amounts of ATP and NADPH + H+ in the chloroplast. 
D)  consume the products of the Calvin cycle. 
E)  produce O2 for the atmosphere.

Question 13

How does rubisco "decide" whether to act as an oxygenase or a carboxylase?

Accepted Answer

A)  Rubisco has 10 times more affinity for O2 than CO2; therefore, it favors O2 fixation. 
B)  If O2 is relatively abundant, rubisco acts as a carboxylase. 
C)  If O2 predominates, rubisco fixes it and the Calvin-Benson cycle occurs. 
D)  Photorespiration is more likely at low temperatures. 
E)  As the ratio of CO2 to O2 falls in the leaf, the reaction of rubisco with O2 is favored, and photorespiration proceeds. 
A)  Rubisco has 10 times more affinity for O2 than CO2; therefore, it favors O2 fixation. 
B)  If O2 is relatively abundant, rubisco acts as a carboxylase. 
C)  If O2 predominates, rubisco fixes it and the Calvin-Benson cycle occurs. 
D)  Photorespiration is more likely at low temperatures. 
E)  As the ratio of CO2 to O2 falls in the leaf, the reaction of rubisco with O2 is favored, and photorespiration proceeds.

Question 14

Which of the following biological groups is dependent on photosynthesis for its survival?

Accepted Answer

A)  Vertebrates 
B)  Mammalia 
C)  Fishes 
D)  Plants 
E)  All of the above 
A)  Vertebrates 
B)  Mammalia 
C)  Fishes 
D)  Plants 
E)  All of the above

Question 15

_______ uses pipes to release CO2 around plants to research the effects of rising atmospheric CO2 on photosynthesis and plant growth.

Accepted Answer

Free-air c

Question 16

Which of the following begins the Calvin cycle that results in the entire pathway being carried out under environmental conditions?

Accepted Answer

A)  3PG is reduced to G3P using ATP and NADPH + H+. 
B)  RuBP is regenerated. 
C)  CO2 and RuBP join forming 3PG. 
D)  G3P is converted into glucose and fructose. 
E)  Any of the above; as a cycle, it can start at any point. 
A)  3PG is reduced to G3P using ATP and NADPH + H+. 
B)  RuBP is regenerated. 
C)  CO2 and RuBP join forming 3PG. 
D)  G3P is converted into glucose and fructose. 
E)  Any of the above; as a cycle, it can start at any point.

Question 17

How many moles of CO2 must enter the Calvin-Benson cycle for the synthesis of one mole of glucose?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  6 
E)  12 
A)  1 
B)  2 
C)  3 
D)  6 
E)  12

Question 18

The O2 found in Earth's atmosphere is generated from photosystem _______ of noncyclic photophosphorylation.

Accepted Answer

Question 19

In C3 plants, the Calvin-Benson cycle occurs in the chloroplasts of _______ cells, whereas in C4 plants the cycle occurs in the _______ cells.

Accepted Answer

mesophyll;

Question 20

As atmospheric CO2 rises globally, it is known there will be

Accepted Answer

A)  an increase in photosynthetic rate. 
B)  an increase in temperature. 
C)  an increase in rainfall. 
D)  a decrease in temperature. 
E)  a decrease in rainfall. 
A)  an increase in photosynthetic rate. 
B)  an increase in temperature. 
C)  an increase in rainfall. 
D)  a decrease in temperature. 
E)  a decrease in rainfall.

Exam 10: Photosynthesis: Energy From Sunlight

Cyclic electron transport

In plants, the reactions of glycolysis occur

The level of atmospheric CO2 has varied considerably over the years. Currently, the level of atmospheric CO2

When CO2 is added to RuBP, the first stable product synthesized is

Compared to long-wavelength photons, short-wavelength photons have

Which of the following statements regarding the relationship between photosynthesis and cellular respiration in plants is true?

Refer to the diagram below. The Ruben and Kamen experiments tracing isotopes of oxygen through the process of photosynthesis proved that

Rubisco has both carboxylase and oxygenase activities. These processes compete with each other. What determines which function the enzyme has? What conditions favor photorespiration? What conditions favor photosynthesis?

Photorespiration

The enzyme rubisco is found in

Plants are green because

Cyclic and noncyclic electron flow are used in plants to

How does rubisco "decide" whether to act as an oxygenase or a carboxylase?

Which of the following biological groups is dependent on photosynthesis for its survival?

_______ uses pipes to release CO2 around plants to research the effects of rising atmospheric CO2 on photosynthesis and plant growth.

Which of the following begins the Calvin cycle that results in the entire pathway being carried out under environmental conditions?

How many moles of CO2 must enter the Calvin-Benson cycle for the synthesis of one mole of glucose?

The O2 found in Earth's atmosphere is generated from photosystem _______ of noncyclic photophosphorylation.

In C3 plants, the Calvin-Benson cycle occurs in the chloroplasts of _______ cells, whereas in C4 plants the cycle occurs in the _______ cells.

As atmospheric CO2 rises globally, it is known there will be

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The level of atmospheric CO₂ has varied considerably over the years. Currently, the level of atmospheric CO₂

When CO₂ is added to RuBP, the first stable product synthesized is

_______ uses pipes to release CO₂ around plants to research the effects of rising atmospheric CO₂ on photosynthesis and plant growth.

How many moles of CO₂ must enter the Calvin-Benson cycle for the synthesis of one mole of glucose?

The O₂ found in Earth's atmosphere is generated from photosystem _______ of noncyclic photophosphorylation.

In C₃ plants, the Calvin-Benson cycle occurs in the chloroplasts of _ cells, whereas in C₄ plants the cycle occurs in the _ cells.

As atmospheric CO₂ rises globally, it is known there will be