Question 1

A product of photosynthesis,________,is the chief source of energy for most organisms.

Accepted Answer

A) oxygen 
B) sucrose 
C) glucose 
D) All of the answer choices. 
A) oxygen 
B) sucrose 
C) glucose 
D) All of the answer choices. C

Question 2

Characterize these reactions involved in the Calvin cycle.

Accepted Answer

A) These are reactions involved in the regeneration of RuBP.The reactions include an exergonic reaction (ATP breaks down into ADP)and the reduction of the coenzyme NADPH. 
B) These reactions are involved in the reduction of CO2.Energy is required in the form of ATP,which is hydrolyzed to ADP.The substrate BPG is reduced,while the coenzyme NADPH is oxidized. 
C) These reactions are involved in the fixation of CO2. Energy is required in the form of ADP,which is hydrolyzed to ATP.The substrate BPG is oxidized,while the coenzyme NADPH is reduced. 
D) These reactions are part of the light reactions in a noncyclic pathway.ATP and NADPH are used during these reactions. 
A) These are reactions involved in the regeneration of RuBP.The reactions include an exergonic reaction (ATP breaks down into ADP)and the reduction of the coenzyme NADPH. 
B) These reactions are involved in the reduction of CO2.Energy is required in the form of ATP,which is hydrolyzed to ADP.The substrate BPG is reduced,while the coenzyme NADPH is oxidized. 
C) These reactions are involved in the fixation of CO2. Energy is required in the form of ADP,which is hydrolyzed to ATP.The substrate BPG is oxidized,while the coenzyme NADPH is reduced. 
D) These reactions are part of the light reactions in a noncyclic pathway.ATP and NADPH are used during these reactions. B

Question 3

Which of the following is a common photosynthetic pigment found in plants? Select all that apply.

Accepted Answer

A) chlorophyll a 
B) chlorophyll c 
C) carotenoids 
D) chlorophyll b 
A) chlorophyll a 
B) chlorophyll c 
C) carotenoids 
D) chlorophyll b A,C,D

Question 4

Phosphoenolpyruvate carboxylase (PEPCase)fixes carbon dioxide (C1)to PEP (C3)to form oxaloacetate (C4)within mesophyll cells of the C4 plants.

Accepted Answer

A) True 
 B)False

Question 5

The action spectrum of photosynthesis shows a high light absorption for violet/blue and orange/red and a low absorption for green/yellow.If we were to set up an experiment where narrow bands of unicolored light were shown on an aquatic plant such as Elodea,and we counted the number of bubbles of oxygen produced as an indicator of photosynthetic rate,how would the graph appear?

Accepted Answer

A) just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green 
B) exactly inverted from the action spectrum with a peak for yellow/green 
C) perfectly flat because many wavelengths are used by chlorophyll 
D) a descending line because ultraviolet light has more energy than infrared 
E) There is no way to guess without actually running the experiment. 
A) just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green 
B) exactly inverted from the action spectrum with a peak for yellow/green 
C) perfectly flat because many wavelengths are used by chlorophyll 
D) a descending line because ultraviolet light has more energy than infrared 
E) There is no way to guess without actually running the experiment.

Question 6

Create an experiment that tests this null hypothesis: The rate of photosynthesis does not vary with different wavelengths of light.

Accepted Answer

Answers will vary: An example follows.A

Question 7

Why are plants green?

Accepted Answer

A) They absorb only green wavelengths of light. 
B) They absorb only yellow and blue wavelengths of light,which when mixed within the leaf,give plants their characteristic green color. 
C) They reflect all of the ultraviolet wavelengths and absorb all of the visible light spectrum. 
D) They reflect green wavelengths of light and absorb other colors of the visible light spectrum. 
E) They reflect the colors of the visible light spectrum and absorb all of the wavelengths associated with the ultraviolet spectrum. 
A) They absorb only green wavelengths of light. 
B) They absorb only yellow and blue wavelengths of light,which when mixed within the leaf,give plants their characteristic green color. 
C) They reflect all of the ultraviolet wavelengths and absorb all of the visible light spectrum. 
D) They reflect green wavelengths of light and absorb other colors of the visible light spectrum. 
E) They reflect the colors of the visible light spectrum and absorb all of the wavelengths associated with the ultraviolet spectrum.

Question 8

G3P (glyceraldehyde-3-phosphate)can be used by plants to form which of the following? Select all that apply.

Accepted Answer

A) fatty acids 
B) amino acids 
C) carbon dioxide 
D) starch 
E) NADPH 
A) fatty acids 
B) amino acids 
C) carbon dioxide 
D) starch 
E) NADPH

Question 9

When an electron has been excited to a higher energy state,it can then drop back to the original level,re-emitting the light as fluorescence.When chlorophyll is extracted in solution,and a bright red or blue light is shown on it,the chlorophyll fluoresces brightly.However,when the chlorophyll is packaged inside chloroplasts and the red or blue light is turned on,there is no fluorescence.This most likely indicates that

Accepted Answer

A) the red and blue light waves are reflected by the chlorophyll membrane. 
B) chlorophyll in solution is a different molecule than chlorophyll in a chloroplast. 
C) excited electrons are transferred to electron acceptors in the chloroplast. 
D) fluorescence does not work in living cells. 
E) green light must be used to make living cells fluoresce. 
A) the red and blue light waves are reflected by the chlorophyll membrane. 
B) chlorophyll in solution is a different molecule than chlorophyll in a chloroplast. 
C) excited electrons are transferred to electron acceptors in the chloroplast. 
D) fluorescence does not work in living cells. 
E) green light must be used to make living cells fluoresce.

Question 10

What structure is required for an eukaryotic organism to be classified as an autotroph?

Accepted Answer

A) chloroplast 
B) mitochondria 
C) nucleus 
D) Golgi body 
A) chloroplast 
B) mitochondria 
C) nucleus 
D) Golgi body

Question 11

Photosynthesis involves oxidation - reduction and the movement of electrons from one molecule to another.Recall what oxidation and reduction reactions are and study the figure to identify A and B as either oxidation or reduction.

Accepted Answer

A is a reduction.Carbon dioxide is reduc

Question 12

The light-dependent reactions of photosynthesis occur in the stroma of the chloroplast.

Accepted Answer

A) True 
 B)False

Question 13

The function of sunlight in photosynthesis is to

Accepted Answer

A) reduce NADPH to NADP. 
B) fix O2 in the Calvin cycle. 
C) excite electrons in chlorophyll. 
D) combine carbon dioxide and water to form ATP and NADPH. 
E) split water releasing oxygen. 
A) reduce NADPH to NADP. 
B) fix O2 in the Calvin cycle. 
C) excite electrons in chlorophyll. 
D) combine carbon dioxide and water to form ATP and NADPH. 
E) split water releasing oxygen.

Question 14

What would happen if a drug directly interfered with the functioning of RuBP carboxylase?

Accepted Answer

A) Water would not be split at the start of photosystem II,halting the light reactions. 
B) Chemiosmosis and ATP production would cease,halting the Calvin cycle. 
C) Carbon dioxide would not be fixed to RuBP,stalling the Calvin cycle. 
D) RuBP would not be regenerated from G3P,halting the Calvin cycle. 
A) Water would not be split at the start of photosystem II,halting the light reactions. 
B) Chemiosmosis and ATP production would cease,halting the Calvin cycle. 
C) Carbon dioxide would not be fixed to RuBP,stalling the Calvin cycle. 
D) RuBP would not be regenerated from G3P,halting the Calvin cycle.

Question 15

In the questions that follow, you will be asked to identify the blanks on the below diagram using the word bank: NADPH, NADP, ATP, ADP + P, carbon dioxide, oxygen, carbohydrate, water. Briefly explain the significance of each item.
 
-B is ________.

Accepted Answer

B is oxygen.The splitting of water durin

Question 16

Chemiosmotic ATP synthesis occurs in the cytosol of the cell.

Accepted Answer

A) True 
 B)False

Question 17

What is the ultimate destination for the energized electrons during the light reactions of photosynthesis?

Accepted Answer

A) They are taken up by NADP+ to produce NADPH. 
B) They are taken up by NADPH to produce NADP+. 
C) They are taken up by NADH to produce NAD+. 
D) They are taken up by NAD+ to produce NADH. 
A) They are taken up by NADP+ to produce NADPH. 
B) They are taken up by NADPH to produce NADP+. 
C) They are taken up by NADH to produce NAD+. 
D) They are taken up by NAD+ to produce NADH.

Question 18

Which of the following pairs is correct?

Accepted Answer

A) C4 plants = bundle sheath cells contain chlorophyll 
B) C3 plants = bundle sheath cells contain chlorophyll 
C) CAM plants = epidermal cells contain chlorophyll 
D) C4 plants = stoma contain chlorophyll 
A) C4 plants = bundle sheath cells contain chlorophyll 
B) C3 plants = bundle sheath cells contain chlorophyll 
C) CAM plants = epidermal cells contain chlorophyll 
D) C4 plants = stoma contain chlorophyll

Question 19

Photorespiration occurs mainly in

Accepted Answer

A) C3 plants. 
B) C4 plants. 
C) CAM plants. 
D) All of the answer choices. 
A) C3 plants. 
B) C4 plants. 
C) CAM plants. 
D) All of the answer choices.

Question 20

The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule,which is a reaction assisted by large quantities of RuBP carboxylase enzyme.

Accepted Answer

A) True 
 B)False

Exam 7: Photosynthesis

A product of photosynthesis,________,is the chief source of energy for most organisms.

Characterize these reactions involved in the Calvin cycle.

Which of the following is a common photosynthetic pigment found in plants? Select all that apply.

Phosphoenolpyruvate carboxylase (PEPCase)fixes carbon dioxide (C1)to PEP (C3)to form oxaloacetate (C4)within mesophyll cells of the C4 plants.

Create an experiment that tests this null hypothesis: The rate of photosynthesis does not vary with different wavelengths of light.

Why are plants green?

G3P (glyceraldehyde-3-phosphate)can be used by plants to form which of the following? Select all that apply.

What structure is required for an eukaryotic organism to be classified as an autotroph?

Photosynthesis involves oxidation - reduction and the movement of electrons from one molecule to another.Recall what oxidation and reduction reactions are and study the figure to identify A and B as either oxidation or reduction.

The light-dependent reactions of photosynthesis occur in the stroma of the chloroplast.

The function of sunlight in photosynthesis is to

What would happen if a drug directly interfered with the functioning of RuBP carboxylase?

In the questions that follow, you will be asked to identify the blanks on the below diagram using the word bank: NADPH, NADP, ATP, ADP + P, carbon dioxide, oxygen, carbohydrate, water. Briefly explain the significance of each item. -B is ________.

Chemiosmotic ATP synthesis occurs in the cytosol of the cell.

What is the ultimate destination for the energized electrons during the light reactions of photosynthesis?

Which of the following pairs is correct?

Photorespiration occurs mainly in

The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule,which is a reaction assisted by large quantities of RuBP carboxylase enzyme.

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Phosphoenolpyruvate carboxylase (PEPCase)fixes carbon dioxide (C₁)to PEP (C₃)to form oxaloacetate (C₄)within mesophyll cells of the C₄ plants.