Question 1

What is the color of light that chlorophylls absorb that has the highest energy?

Accepted Answer

A)  green
B)  violet-blue
C)  red
D)  yellow-orange B

Question 2

The ATP generated from cellular respiration is not sufficient to drive the Calvin cycle in plants,even if appropriate levels of NADPH and CO2 are present.Why not?

Accepted Answer

A)  Plants do not undergo cellular respiration
B)  Breaking down sugar to provide the energy needed to synthesize sugar would be a futile cycle
C)  The Calvin cycle requires more ATP than can possibly be made from cellular respiration
D)  Cellular respiration and photosynthesis do not happen in the same cells in plants B

Question 3

Since Rubisco can either fix carbon or oxidize RuBP,what condition will be most favorable for glucose production?

Accepted Answer

A)  moderate temperatures
B)  high temperatures
C)  dry climate
D)  high oxygen environment A

Question 4

A plant researcher wants to construct a synthetic cellulose fiber from 20 glucose molecules.How many molecules of CO2 and glyceraldehyde-3-phosphate are needed to construct the fiber?

Accepted Answer

A)  20,40
B)  120,60
C)  120,40
D)  20,60
E)  120,120

Question 5

The Calvin cycle requires all of the following except

Accepted Answer

A)  carbon dioxide.
B)  oxygen.
C)  ATP.
D)  NADPH.
E)  water.

Question 6

During the light-dependent reactions,due to electron transport,the thylakoid space becomes

Accepted Answer

A)  the site of ATP synthesis.
B)  the site of NADPH production.
C)  the site where the Calvin cycle occurs
D)  more acidic than the stroma.

Question 7

Light-dependent reactions generate

Accepted Answer

A)  ATP and NADPH.
B)  NADP+.
C)  CO2.
D)  light.
E)  glucose.

Question 8

In the light-independent reactions of photosynthesis,CO2 is added to a five-carbon molecule known as

Accepted Answer

A)  cellulose.
B)  ribose.
C)  deoxyribose.
D)  RuBP.
E)  CAM.

Question 9

What is common to both photosystems I and II?

Accepted Answer

A)  Both involve the splitting of water to donate an electron to the reaction center
B)  Both involve the generation of oxygen
C)  Both lose an electron to a primary electron acceptor that passes the electron down an electron transport chain leading to the generation of ATP
D)  Both contain a reaction center composed of chlorophyll a
E)  Both are found in the stroma

Question 10

Most plants incorporate carbon dioxide into sugars by means of a cycle of reactions called the

Accepted Answer

A)  CAM cycle.
B)  carbon cycle.
C)  Calvin cycle.
D)  Krebs cycle.

Question 11

Most atmospheric oxygen comes from photosynthesis.From which of the following molecules is the oxygen derived?

Accepted Answer

A)  water
B)  carbon dioxide
C)  glucose
D)  chlorophyll a
E)  chlorophyll b

Question 12

The role of the antenna complex in a photosystem is to

Accepted Answer

A)  transfer excited electrons to the primary electron acceptor.
B)  generate glucose.
C)  generate NADPH.
D)  capture photons from sunlight.

Question 13

Molecules that absorb light are called

Accepted Answer

A)  enzymes.
B)  electron carriers.
C)  pigments.
D)  photosynthesizers.
E)  absorbers.

Question 14

In green plants,which photosystem absorbs photons to excite electrons in the reaction center?

Accepted Answer

A)  Photosystem I
B)  Photosystem II
C)  Photosystem III
D)  Photosystem I and II
E)  Photosystem I,II and III

Question 15

A tomato plant is mutated with gamma radiation.A cellular analysis reveals that ATP synthase complexes found in the thylakoid membrane are inserted backward into the membrane.What is the most likely outcome of this error?

Accepted Answer

A)  A proton gradient will not be established in the thylakoid space in response to the activation of photosystem II
B)  The proton gradient in the thylakoid space will not be able to be used to generate ATP
C)  The thylakoid membrane will become permeable to protons as a result of this change
D)  The ATP synthase will pump protons into the stroma in this orientation
E)  This change is not likely to have any effect on the function of the ATP synthase enzyme with respect to its role in photosynthesis

Question 16

A protein that has been transported past the outer chloroplast membrane would have to pass how many more membranes to reach the stroma and thylakoid lumen,respectively?

Accepted Answer

A)  0,1
B)  1,2
C)  2,3
D)  3,4

Question 17

If the antenna complex did not exist in a particular plant mesophyll cell,what effect would that have on photosynthesis?

Accepted Answer

A)  There would be no expected effect on photosynthesis
B)  These cells would be unable to absorb any light energy
C)  These cells would have a reduced capacity to generate glucose
D)  These cells would be able to fix more carbon dioxide

Question 18

The light-independent reactions of photosynthesis are those that

Accepted Answer

A)  convert glucose into energy.
B)  convert chlorophylls into light energy.
C)  convert water into hydrogen and oxygen.
D)  convert CO2 into reduced molecules (sugars) .
E)  occur only at night.

Question 19

Why is eating carrots thought to be useful for enhancing vision?

Accepted Answer

A)  High levels of chlorophyll in carrots helps with photosynthesis in the eyes.
B)  High levels of beta-carotene can lead to the production of a pigment used in vision.
C)  High levels of carotenoids in carrots can allow vertebrate eyes to perform the dark reactions.
D)  High levels of NADPH in carrots can allow vertebrate eyes to perform the light reactions.

Question 20

As a result of the transition from daytime to nighttime,how will the relative concentrations of glyceraldehyde 3-phosphate (G3P)and ribulose 1,5-bisphosphate (RuBP)change in C3 plants?

Accepted Answer

A)  The concentrations of G3P and RuBP would remain the same.
B)  The concentrations of G3P and RuBP would both decrease.
C)  G3P would increase and RuBP would decrease.
D)  G3P would decrease and RuBP would increase.

Exam 8: Photosynthesis