Question 1

Which statement about ribulose bisphosphate carboxylase/oxygenase (rubisco)  is false?

Accepted Answer

A)   It makes up approximately 50 percent of the protein in every plant leaf.
B)   It produces a four-carbon product.
C)   It has carboxylation activity.
D)   It has an affinity for carbon dioxide.
E)   It is the most abundant protein in the world.F) B) and D)
G) A) and E)

Question 2

Refer to the table below.  The table summarizes characteristics of two metabolic reactions occurring in the chloroplast.The question mark in the table can be replaced with the word _______.

Accepted Answer

The answer of Refer to the table below.  The...

Question 3

In C4 plants, the four-carbon compound that is synthesized by carbon fixation in the mesophyll cells

Accepted Answer

A)   reduces NADP+.
B)   combines with CO2 to produce sugar.
C)   carries CO2 to the bundle sheath cells.
D)   drives the synthesis of ATP.
E)   closes the stomata.F) B) and C)
G) A) and B)

Question 4

Plant cellular respiration occurs

Accepted Answer

A)   only in the dark.
B)   only in the light.
C)   only in C3 plants.
D)   all the time.
E)   in all plants, but fermentation does not.F) A) and E)
G) A) and D)

Question 5

At hourly intervals, researchers measured the change in growth rate of a cactus, a CAM plant, over a 5-day period.The results were used to prepare the graph below.The shaded areas denote dark periods, while white areas denote daylight periods.  Which statement reasonably explains the pattern in the growth rate revealed in this graph? Remember to apply what you know about CAM plants and cells in general as you consider the various statement options.

Accepted Answer

A)   CAM plant growth occurs when the plant is actively taking up carbon in the form of carbon dioxide from the atmosphere.
B)   CAM plant growth occurs at times when the plant is not busy engaged in photosynthetic processes.
C)   CAM plant growth occurs when Calvin cycle enzymes are actively producing G3P, since this compound can be immediately shuttled into anabolic pathways that support cell proliferation.
D)   CAM plant growth occurs in cycles, since each round of cell division can only occur once every 24 hours because of a long period of DNA replication.
E)   CAM plant growth occurs in cycles because light stimulates cell division and dark inhibits cell division.F) C) and E)
G) A) and D)

Question 6

Not all the carbon atoms in the RuBP that enters photorespiration are given off in the form of carbon dioxide.Some of these carbon atoms are able to enter the Calvin cycle in which form?

Accepted Answer

A)   Glycolate
B)   Phosphoglycolate
C)   3-Phosphoglycerate
D)   Malate
E)   SerineF) C) and E)
G) A) and B)

Question 7

Wheat, roses, and rice are examples of

Accepted Answer

A)   CAM plants.
B)   C3 plants.
C)   C4 plants.
D)   succulents.
E)   desert plants.F) A) and E)
G) B) and E)

Question 8

Refer to the table below, which summarizes conditions used in four experiments in which isotopes were used to trace the fate of oxygen atoms during photosynthesis by a terrestrial green plant species. 2 produced by the plants? A)  Experiments 1 and 2 B)  Experiments 2 and 3 C)  Experiments 1 and 3 D)  Experiments 1 and 4 E)  Experiments 3 and 4" class="answers-bank-image d-inline" rel="preload" > Which set of experiments would provide the best data for determining the source of O2 produced by the plants?

Accepted Answer

A)   Experiments 1 and 2
B)   Experiments 2 and 3
C)   Experiments 1 and 3
D)   Experiments 1 and 4
E)   Experiments 3 and 4F) C) and D)
G) A) and D)

Question 9

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

Accepted Answer

Question 10

Does photosynthesis always produce oxygen?

Accepted Answer

Oxygenic photosynthesis supplies the oxy...

Question 11

Refer to the figure below.  This photosystem produces ATP but not NADPH.Explain why the cyclic nature of this system makes it impossible for NADPH to be formed, and why the noncyclic system is able to form NADPH.

Accepted Answer

NADPH is formed only when electrons are ...

Question 12

Refer to the diagram below showing the 1941 experiments of Samuel Ruben and Martin Kamen that traced isotopes of oxygen through the process of photosynthesis. 2 is the source of the oxygen released during photosynthesis. C)  the oxygen released by water is incorporated into sugars. D)  oxygen is needed to make rubisco. E)  NADPH is made during the Calvin cycle." class="answers-bank-image d-inline" rel="preload" > The Ruben and Kamen experiments demonstrated 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 sugars.
D)   oxygen is needed to make rubisco.
E)   NADPH is made during the Calvin cycle.F) B) and C)
G) C) and D)

Question 13

Photosynthesis takes place in plants only in the light.Respiration takes place

Accepted Answer

A)   in plants only in the dark.
B)   in plants only in the light.
C)   in all organisms except plants only in the dark.
D)   in all organisms except plants only in the light.
E)   in all organisms both in the dark and in the light.F) C) and E)
G) B) and E)

Question 14

In both photosynthesis and respiration, protons are pumped across a membrane during

Accepted Answer

A)   reduction of O2.
B)   ATP hydrolysis.
C)   CO2 fixation.
D)   electron transport.
E)   glycolysis.F) C) and D)
G) A) and E)

Question 15

It has been estimated that only about 5 percent of the sun's energy that reaches Earth is captured as chemical energy in the form of carbohydrates via photosynthesis.How much of the sun's energy reaching Earth do you estimate is stored in the cells of nonphotosynthetic organisms?

Accepted Answer

A)   0 percent
B)   Above 0 but well below 5 percent
C)   Approximately 5 percent
D)   5 to 15 percent
E)   15 to 50 percentF) B) and E)
G) All of the above

Question 16

What would happen to photosynthesis if a plant were only exposed to light with wavelengths 525-575 nm?

Accepted Answer

A)   Photosynthesis would occur in C3 plants but not in C4 plants.
B)   Photosynthesis would occur in C4 plants but not in C3 plants.
C)   Chlorophyll a but not chlorophyll b would serve as the primary light-harvesting pigment, and photosynthesis would occur.
D)   The rate of photosynthesis would be slow since chlorophyll a and chlorophyll b absorb light energy weakly in this wavelength range.
E)   Photosystem I but not photosystem II would accept electrons from the light-harvesting apparatus, and photosynthesis would occur.F) None of the above
G) B) and C)

Question 17

Photosystem II

Accepted Answer

A)   contains the P700 chlorophylls.
B)   gains electrons from oxygen.
C)   produces ATP.
D)   is the first light-absorbing complex in photosynthetic electron transport.
E)   can undergo cyclic electron transport.F) B) and E)
G) A) and B)

Question 18

When C4 and _______ plants are exposed to light and CO2, a four-carbon compound (oxaloacetate) is the first carbon-containing product of carbon fixation.

Accepted Answer

Question 19

A student was asked to describe the Calvin cycle in a chloroplast.He began by talking about the carbon-fixation reaction catalyzed by rubisco between carbon dioxide and ribulose 1,5-bisphosphate (RuBP) that produces 3-phosphoglycerate (3PG).The student finished by describing reactions involving ATP and NADPH that convert 3-phosphoglycerate to glyceraldehyde 3-phosphate (G3P), which can be used to produce sucrose and other sugars in the cytoplasm.The student neglected to describe the third process of the Calvin cycle, which involves _______.

Accepted Answer

regenerati...

Question 20

In sunny, hot weather, corn, which is a C4 plant, has a survival advantage over wheat, which is a C3 plant, because

Accepted Answer

A)   wheat loses water through its stomata and corn does not.
B)   wheat is less efficient in its use of ATP than corn is.
C)   corn undergoes photorespiration and wheat does not.
D)   corn is able to keep its stomata open and wheat cannot.
E)   corn keeps CO2 levels high around rubisco even when stomata are closed.F) A) and D)
G) C) and D)

Exam 10: Photosynthesis: Energy From Sunlight

When C₄ and _______ plants are exposed to light and CO₂, a four-carbon compound (oxaloacetate) is the first carbon-containing product of carbon fixation.

Correct Answer
verified

In both photosynthesis and respiration, protons are pumped across a membrane during

Correct Answer
verified

Correct Answer
verified

Refer to the figure below. This photosystem produces ATP but not NADPH.Explain why the cyclic nature of this system makes it impossible for NADPH to be formed, and why the noncyclic system is able to form NADPH.

Correct Answer
verified
NADPH is formed only when electrons are ...
View Answer

Correct Answer
verified

Plant cellular respiration occurs

Correct Answer
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What would happen to photosynthesis if a plant were only exposed to light with wavelengths 525-575 nm?

Correct Answer
verified

Which statement about ribulose bisphosphate carboxylase/oxygenase (rubisco) is false?

Correct Answer
verified

It has been estimated that only about 5 percent of the sun's energy that reaches Earth is captured as chemical energy in the form of carbohydrates via photosynthesis.How much of the sun's energy reaching Earth do you estimate is stored in the cells of nonphotosynthetic organisms?

Correct Answer
verified

Refer to the diagram below showing the 1941 experiments of Samuel Ruben and Martin Kamen that traced isotopes of oxygen through the process of photosynthesis. The Ruben and Kamen experiments demonstrated that

Correct Answer
verified

Refer to the table below. The table summarizes characteristics of two metabolic reactions occurring in the chloroplast.The question mark in the table can be replaced with the word _______.

Correct Answer
verified

Not all the carbon atoms in the RuBP that enters photorespiration are given off in the form of carbon dioxide.Some of these carbon atoms are able to enter the Calvin cycle in which form?

Correct Answer
verified

Photosynthesis takes place in plants only in the light.Respiration takes place

Correct Answer
verified

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

Correct Answer
verified

In sunny, hot weather, corn, which is a C₄ plant, has a survival advantage over wheat, which is a C₃ plant, because

Correct Answer
verified

Does photosynthesis always produce oxygen?

Correct Answer
verified
Oxygenic photosynthesis supplies the oxy...
View Answer

Wheat, roses, and rice are examples of

Correct Answer
verified

Photosystem II

Correct Answer
verified

Correct Answer
verified
regenerati...
View Answer

In C₄ plants, the four-carbon compound that is synthesized by carbon fixation in the mesophyll cells

Correct Answer
verified

Exam 10: Photosynthesis: Energy From Sunlight

When C4 and _______ plants are exposed to light and CO2, a four-carbon compound (oxaloacetate) is the first carbon-containing product of carbon fixation.

Correct AnswerverifiedShow Answer

In both photosynthesis and respiration, protons are pumped across a membrane during

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Refer to the figure below. This photosystem produces ATP but not NADPH.Explain why the cyclic nature of this system makes it impossible for NADPH to be formed, and why the noncyclic system is able to form NADPH.

Correct AnswerverifiedNADPH is formed only when electrons are ...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Plant cellular respiration occurs

Correct AnswerverifiedShow Answer

What would happen to photosynthesis if a plant were only exposed to light with wavelengths 525-575 nm?

Correct AnswerverifiedShow Answer

Which statement about ribulose bisphosphate carboxylase/oxygenase (rubisco) is false?

Correct AnswerverifiedShow Answer

It has been estimated that only about 5 percent of the sun's energy that reaches Earth is captured as chemical energy in the form of carbohydrates via photosynthesis.How much of the sun's energy reaching Earth do you estimate is stored in the cells of nonphotosynthetic organisms?

Correct AnswerverifiedShow Answer

Refer to the diagram below showing the 1941 experiments of Samuel Ruben and Martin Kamen that traced isotopes of oxygen through the process of photosynthesis. The Ruben and Kamen experiments demonstrated that

Correct AnswerverifiedShow Answer

Refer to the table below. The table summarizes characteristics of two metabolic reactions occurring in the chloroplast.The question mark in the table can be replaced with the word _______.

Correct AnswerverifiedShow Answer

Not all the carbon atoms in the RuBP that enters photorespiration are given off in the form of carbon dioxide.Some of these carbon atoms are able to enter the Calvin cycle in which form?

Correct AnswerverifiedShow Answer

Photosynthesis takes place in plants only in the light.Respiration takes place

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In sunny, hot weather, corn, which is a C4 plant, has a survival advantage over wheat, which is a C3 plant, because

Correct AnswerverifiedShow Answer

Does photosynthesis always produce oxygen?

Correct AnswerverifiedOxygenic photosynthesis supplies the oxy...View AnswerShow Answer

Wheat, roses, and rice are examples of

Correct AnswerverifiedShow Answer

Photosystem II

Correct AnswerverifiedShow Answer

Correct Answerverifiedregenerati...View AnswerShow Answer

In C4 plants, the four-carbon compound that is synthesized by carbon fixation in the mesophyll cells

Correct AnswerverifiedShow Answer

When C₄ and _______ plants are exposed to light and CO₂, a four-carbon compound (oxaloacetate) is the first carbon-containing product of carbon fixation.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
NADPH is formed only when electrons are ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

In sunny, hot weather, corn, which is a C₄ plant, has a survival advantage over wheat, which is a C₃ plant, because

Correct Answer
verified

Correct Answer
verified
Oxygenic photosynthesis supplies the oxy...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
regenerati...
View Answer

In C₄ plants, the four-carbon compound that is synthesized by carbon fixation in the mesophyll cells

Correct Answer
verified