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Capter 8 Set 2

front 1

During photosynthesis, the energy given up by electrons as they move through the electron transport chain is used to

back 1

generate an electrochemical H+ gradient across a membrane.

front 2

Which portion of the photosynthetic apparatus is involved in the oxidation or splitting of water?

back 2

manganese cluster

front 3

Which of the following represents a reactant or input for the light reaction of photosynthesis?

back 3

H2O

front 4

What is the main role of the pigment molecules within the antenna or light-harvesting complex?

back 4

Absorb photons and transfer light energy to the reaction center chlorophyll

front 5

Which of the following statements regarding photosystem II is FALSE?

back 5

Photosystem II strips an electron from water for direct transfer to the electron transport chain.

front 6

Which of the following contributes to the electrochemical gradient that exists across the thylakoid membrane during photosynthesis?

back 6

The electron transport chain.

The splitting of water to produce H+ and oxygen in the thylakoid lumen.

The depletion of H+ in the stroma during NADPH production.

The pumping of H+ into the thylakoid lumen by electron transport proteins.

front 7

Which of the following best represents the path of electron flow that occurs during photosynthesis?

back 7

H2O-->P680-->Final Electron AcceptorElectron transport chain-->P700

front 8

What are the primary functions of both photosystems I and II?

back 8

produce ATP and NADPH

front 9

Which portion of the photosynthetic apparatus absorbs light?

back 9

both photosystem I and photosystem II

front 10

How might a plant cope with the fact that the Calvin cycle uses more ATP than NADPH, yet produces roughly the same amount of both energy intermediates in photosystems I and II?

back 10

Photosynthesis can revert from a noncyclic to cyclic electron flow.

front 11

Which order of events for the Calvin cycle is correct?

back 11

III. Carbon fixation
I. Reduction
II. Regeneration of the CO2 acceptor (RuBP)

front 12

Where does the Calvin cycle occur?

back 12

chloroplast stroma

front 13

This molecule combines with CO2 to form the 3-carbon substance, 3-phosphoglycerate.

back 13

ribulose biphoshpate (RuBP)

front 14

Which of the following requires both ATP and NADPH?

back 14

the Calvin cycle only

front 15

Using 14CO2 as a radioactive tracer, which of the following molecules would be the last to incorporate 14C within the Calvin cycle?

back 15

ribulose biphosphate (RuBP)

front 16

Which of the following is NOT a product of the Calvin cycle?

back 16

NADPH

front 17

All of the following are required for the Calvin cycle EXCEPT

back 17

H2O.

front 18

Which of the following statements about photorespiration is INCORRECT?

back 18

It utilizes the enzyme PEP carboxylase rather than Rubisco to produce 3-phosphoglycerate.

front 19

Which of the following has the highest photosynthetic efficiency in hot and dry environments?

back 19

C4 plants

front 20

Which is TRUE of succulent plants such as cacti or pineapple?

back 20

They produce 4-carbon malate in the first step of carbon fixation

front 21

CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as corn in which of the following way?

back 21

CAM plants are limited to producing CO2 for the Calvin cycle during the day, while C4 plants produce CO2 for the Calvin cycle both during the day and at night.

front 22

Which of the following is the primary advantage of C4 plants over C3 plants?

back 22

C4 plants minimize photorespiration compared with C3 plants.

C4 plants can produce sugars more efficiently than C3 plants under hot, arid conditions.

C4 plants can produce CO2 needed for sugar production in the Calvin cycle more efficiently than C3 plants.

Relative to C3 plants, C4 plants can keep their stomata closed more frequently to limit water evaporation, yet can still produce significant CO2 needed for sugar production