Question 1

The chemical energy stored from photosynthesis represents _______ percent of the total energy of the sunlight hitting a green leaf.

Accepted Answer

A)   5
B)   10
C)   30
D)   50
E)   100F) All of the above
G) B) and D)

Question 2

How many micromoles of 3-phosphoglycerate would be formed by rubisco if 4 M of RuBP were added to the solution in the presence of CO2 and the absence of O2?

Accepted Answer

A)   1
B)   2
C)   4
D)   8
E)   16F) A) and B)
G) All of the above

Question 3

Refer to the figure below.  In the figure, how should boxes X, Y, and Z be labeled?

Accepted Answer

A)   X = regeneration of RuBP, Y = carbon fixation, Z = reduction and sugar production
B)   X = carbon fixation, Y = reduction and sugar production, Z = regeneration of RuBP
C)   X = reduction and sugar production, Y = regeneration of RuBP, Z = carbon fixation
D)   X = regeneration of RuBP, Y = reduction and sugar production, Z = carbon fixation
E)   X = reduction and sugar production, Y = carbon fixation, Z = regeneration of RuBPF) A) and B)
G) A) and E)

Question 4

In noncyclic photophosphorylation, oxidized chlorophyll in photosystem I returns to its reduced state by

Accepted Answer

A)   splitting water.
B)   accepting electrons from photosystem II through the electron transport chain.
C)   absorbing two photons of light.
D)   taking electrons from NADPH.
E)   hydrolyzing ATP.F) A) and C)
G) B) and D)

Question 5

Refer to the graph below summarizing data collected using rubisco purified from chloroplasts.It shows how the catalytic activity of rubisco changes in response to varying times of incubation, either with an oxidizing agent or with a reducing agent.  Thioredoxin is a protein inside the stroma of a chloroplast that can act as an oxidizing or a reducing agent.Thioredoxin is reduced by ferredoxin in photosystem I.Based on this information and the graph, how do you predict thioredoxin will affect rubisco inside cells of a living plant when the plant is moved from the dark into the light?

Accepted Answer

A)   Rubisco activity will remain constant, as thioredoxin will not change.
B)   Rubisco activity will increase because thioredoxin will become a reducing agent.
C)   Rubisco activity will increase because thioredoxin will become an oxidizing agent.
D)   Rubisco activity will decrease because thioredoxin will become a reducing agent.
E)   Rubisco activity will decrease because thioredoxin will become an oxidizing agent.F) A) and D)
G) B) and E)

Question 6

Refer to the graph below.  This graph was generated using data collected over a 24-hour period on the rate of carbon dioxide uptake by a leaf on a living plant.Based on the pattern revealed by the data, it can be concluded that the plant can be classified as a _______ plant.

Accepted Answer

The answer of Refer to the graph below.  This...

Question 7

Refer to the table below showing data collected from chloroplasts isolated from spinach leaves.The chloroplasts were incubated with either compound Q or Z, or with no additions in the control.After 30 minutes of incubation, chloroplasts were analyzed for the photosynthetic functions shown in the table.  Assume that compounds Q and Z directly affect components involved in the light reactions.What do these data indicate about the relationship between the light reactions and the light-independent reactions?

Accepted Answer

A)   The light-independent reactions can occur even if the light reactions are inhibited by chemical agents.
B)   If a subset of the light reactions is functional, that is sufficient for the light-independent reactions to also be functional.
C)   At least one of the products of the light reactions is essential in enabling the light-independent reactions to run.
D)   Chemical agents can reverse the sequence of the light reactions and the light-independent reactions.
E)   Light reactions and light-independent reactions can be induced to reverse their dependency on light by the actions of chemical agents.F) C) and D)
G) B) and C)

Question 8

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

Accepted Answer

A)   CO2
B)   H2O
C)   NADPH + H+
D)   O2 gas
E)   ATPF) B) and E)
G) A) and B)

Question 9

In the hydrolysis of H2O to protons and oxygen during photosynthesis, electrons are transferred to P680.This reaction is an example of

Accepted Answer

A)   a redox reaction.
B)   a metabolic pathway.
C)   oxidative phosphorylation.
D)   the creation of a proton gradient.
E)   an aerobic reaction.F) A) and D)
G) B) and D)

Question 10

The carbon-fixation reactions of photosynthesis require more ATP than NADPH.The additional ATP is provided by

Accepted Answer

A)   the splitting of water.
B)   the reduction of oxygen.
C)   the oxidation of sugars.
D)   cyclic electron transport.
E)   noncyclic electron transport.F) A) and B)
G) C) and D)

Question 11

Which statement about chlorophyll 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 light-harvesting complexes also known as antenna systems.
D)   Most of the chlorophyll in a plant participates in an oxidation-reduction reaction.
E)   Chlorophyll contains Mg2+.F) None of the above
G) D) and E)

Question 12

Which statement regarding the electron transport chain between photosystem II and photosystem I is true?

Accepted Answer

A)   Its terminal electron acceptor is oxygen.
B)   Its terminal electron acceptor is P680.
C)   Most of its components are found in the lumen of the thylakoid.
D)   It generates a pH gradient that supplies the energy for ATP synthesis.
E)   It generates NADPH.F) D) and E)
G) C) and E)

Question 13

The light-independent reactions cannot run without the products of the _______ reactions.

Accepted Answer

The answer of The light-independent reactions cannot run without the...

Question 14

The net chemical changes that result from photosynthesis can be summarized in the following balanced chemical equation:
6 CO2 + 6 H2O F1F1F1S1F1F1F10 C6H12O6 + 6 O2
However, this equation can be made more complete by adding the word "energy" to the (left/right) _______ side of the equation to show how energy is involved in this process.

Accepted Answer

Question 15

A graph that plots the rate at which CO2 is converted to sugar versus the wavelength of light illuminating a leaf is called

Accepted Answer

A)   a Planck equation plot.
B)   an absorption spectrum.
C)   an enzyme kinetics plot.
D)   an electromagnetic spectrum.
E)   an action spectrum.F) A) and B)
G) A) and C)

Question 16

The first product of CO2 fixation in C4 plants is

Accepted Answer

A)   rubisco.
B)   3-phosphoglycerate (3PG) .
C)   oxaloacetate.
D)   PEP.
E)   RuBP.F) B) and E)
G) C) and D)

Question 17

Refer to the figure below.  Based on the process shown in the figure, it can be predicted that the pH in the stroma will _______ when a green plant is exposed to light.

Accepted Answer

The answer of Refer to the figure below.  Based...

Question 18

The first step in noncyclic electron transport includes

Accepted Answer

A)   the P680 reaction center being excited by a photon.
B)   water being oxidized by oxygen.
C)   NADPH being produced.
D)   electrons flowing through plastoquinone (PQ) .
E)   protons being actively transported into the thylakoid lumen.F) All of the above
G) A) and D)

Question 19

A group of scientists led by Melvin _______ conducted experiments demonstrating that RuBP is the CO2 acceptor in the dark reactions of photosynthesis.

Accepted Answer

Question 20

The enzyme PEP carboxylase

Accepted Answer

A)   can fix CO2 even at relatively low CO2 concentrations.
B)   catalyzes the synthesis of RuBP.
C)   catalyzes the synthesis of 3PG.
D)   is found in the chloroplasts of bundle sheath cells.
E)   couples the synthesis of ATP to the diffusion of protons.F) A) and C)
G) B) and C)

Exam 10: Photosynthesis: Energy From Sunlight

The carbon-fixation reactions of photosynthesis require more ATP than NADPH.The additional ATP is provided by

Correct Answer
verified

Which statement regarding the electron transport chain between photosystem II and photosystem I is true?

Correct Answer
verified

A group of scientists led by Melvin _______ conducted experiments demonstrating that RuBP is the CO₂ acceptor in the dark reactions of photosynthesis.

Correct Answer
verified

Refer to the graph below. This graph was generated using data collected over a 24-hour period on the rate of carbon dioxide uptake by a leaf on a living plant.Based on the pattern revealed by the data, it can be concluded that the plant can be classified as a _______ plant.

Correct Answer
verified

Refer to the figure below. In the figure, how should boxes X, Y, and Z be labeled?

Correct Answer
verified

How many micromoles of 3-phosphoglycerate would be formed by rubisco if 4 M of RuBP were added to the solution in the presence of CO₂and the absence of O₂?

Correct Answer
verified

In the hydrolysis of H₂O to protons and oxygen during photosynthesis, electrons are transferred to P₆₈₀.This reaction is an example of

Correct Answer
verified

The light-independent reactions cannot run without the products of the _______ reactions.

Correct Answer
verified

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

Correct Answer
verified

The chemical energy stored from photosynthesis represents _______ percent of the total energy of the sunlight hitting a green leaf.

Correct Answer
verified

The enzyme PEP carboxylase

Correct Answer
verified

The first product of CO₂ fixation in C₄ plants is

Correct Answer
verified

Correct Answer
verified

In noncyclic photophosphorylation, oxidized chlorophyll in photosystem I returns to its reduced state by

Correct Answer
verified

Correct Answer
verified

A graph that plots the rate at which CO₂ is converted to sugar versus the wavelength of light illuminating a leaf is called

Correct Answer
verified

The first step in noncyclic electron transport includes

Correct Answer
verified

Refer to the figure below. Based on the process shown in the figure, it can be predicted that the pH in the stroma will _______ when a green plant is exposed to light.

Correct Answer
verified

Which statement about chlorophyll is false?

Correct Answer
verified

Correct Answer
verified

Exam 10: Photosynthesis: Energy From Sunlight

The carbon-fixation reactions of photosynthesis require more ATP than NADPH.The additional ATP is provided by

Correct AnswerverifiedShow Answer

Which statement regarding the electron transport chain between photosystem II and photosystem I is true?

Correct AnswerverifiedShow Answer

A group of scientists led by Melvin _______ conducted experiments demonstrating that RuBP is the CO2 acceptor in the dark reactions of photosynthesis.

Correct AnswerverifiedShow Answer

Refer to the graph below. This graph was generated using data collected over a 24-hour period on the rate of carbon dioxide uptake by a leaf on a living plant.Based on the pattern revealed by the data, it can be concluded that the plant can be classified as a _______ plant.

Correct AnswerverifiedShow Answer

Refer to the figure below. In the figure, how should boxes X, Y, and Z be labeled?

Correct AnswerverifiedShow Answer

How many micromoles of 3-phosphoglycerate would be formed by rubisco if 4 M of RuBP were added to the solution in the presence of CO2 and the absence of O2?

Correct AnswerverifiedShow Answer

In the hydrolysis of H2O to protons and oxygen during photosynthesis, electrons are transferred to P680.This reaction is an example of

Correct AnswerverifiedShow Answer

The light-independent reactions cannot run without the products of the _______ reactions.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The chemical energy stored from photosynthesis represents _______ percent of the total energy of the sunlight hitting a green leaf.

Correct AnswerverifiedShow Answer

The enzyme PEP carboxylase

Correct AnswerverifiedShow Answer

The first product of CO2 fixation in C4 plants is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In noncyclic photophosphorylation, oxidized chlorophyll in photosystem I returns to its reduced state by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A graph that plots the rate at which CO2 is converted to sugar versus the wavelength of light illuminating a leaf is called

Correct AnswerverifiedShow Answer

The first step in noncyclic electron transport includes

Correct AnswerverifiedShow Answer

Refer to the figure below. Based on the process shown in the figure, it can be predicted that the pH in the stroma will _______ when a green plant is exposed to light.

Correct AnswerverifiedShow Answer

Which statement about chlorophyll is false?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A group of scientists led by Melvin _______ conducted experiments demonstrating that RuBP is the CO₂ acceptor in the dark reactions of photosynthesis.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many micromoles of 3-phosphoglycerate would be formed by rubisco if 4 M of RuBP were added to the solution in the presence of CO₂and the absence of O₂?

Correct Answer
verified

In the hydrolysis of H₂O to protons and oxygen during photosynthesis, electrons are transferred to P₆₈₀.This reaction is an example of

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The first product of CO₂ fixation in C₄ plants is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A graph that plots the rate at which CO₂ is converted to sugar versus the wavelength of light illuminating a leaf is called

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified