Photosynthesis

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35 terms

Photorespiration lowers the efficiency of photosynthesis by removing which of the following from the Calvin cycle?

ribulose biphosphate molecules

Which of the following statements about the light reactions of photosynthesis is false?

the proton gradient is used to reduce NADP.

The primary function of the light reactions of photosynthesis is

to produce energy-rich ATP and NADPH

The reactions of the Calvin cycle require all of the following molecules except

RuBP

You have discovered a new flower speicies that has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are not being absorbed by this pigment?

red and yellow

All of the events listed below occur in the energy-capturing light reactions of photosynthesis except

CO2 is incorporated into PGA

Which of the following are products of the Calvin cycle and are utilized in the light reactions of photosynthesis?

ADP, PI, and NADP+

Where does the Calvin cycle of photosynthesis take place?

stroma of the chloroplast

Which of the following enzymes is probably the most abundant protein in the world?

RuBP carboxylase/oxygenase

In the C4 photosynthesis, carbon fixation takes place in the _______cells, and then is transferred as malic or aspartic acid to _____cells where carbon dioxide is released for entry into the Calvin cycle.

mesophyll; bundle sheath

Because of the bundle sheath cells are relatively protected from atmospheric oxygen, the level of ________is held minimum in C4 plants

photorespiration

Which of the following events in the functioning of photosystem II is false?

The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP+

On which of the following features do most plant and animal cells differ?

primary energy source

Which of the following is not true of riboluse biphosphate carboxylase

It catalyzes a phosphorylation reaction

In a plant cell, where is the ATP synthase located?

thylakoid membrane and inner mitochondrial membrane

All of the following statements are correct regarding the Calvin cycle of photosynthesis except

These reactions begin soon after sundown and end before sunrise

If photosynthesizing green algae are provided with CO2 synthesized with heavy oxygen (18O), later analysis will show that all but one of the following compounds produced by the algae contain the 18O label. that one exception is

O2

The process of noncyclic photophosphorylation uses light energy to synthesize

ATP and NADPH

Members of the CAM plants differ from C4 plants in that they

incorporate carbon dioxide into organic acids at night

Which of the following is not directly associated with photosystem II

photophosphorylation

In green plants, the primary function of the Calvin cycle is to

construct simple sugars from CO2

You are a research scientist studying photosynthesis. In an experiment performed during the day, you provide a new plant, just discovered with radioactive carbon as a metabolic tracer. The tracer is incorporated first in to oxaloacetic acid. The plant is best characterized as a

C4 plant

What are the products of the light reactions that are used by the Calvin cycle?

ATP and NADPH

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

to harvest photons and transfer light energy to the reaction center chlorophyll

Which of the following discovered that water is part of the photosynthesis

Jans van Helmont

Produces molecular oxygen

light reactions

forms a proton gradient

Calvin cycle

Requires ATP

Calvin cycle

Produces NADP+

neither light reaction or calvin cycle

produces NADPH

light reactions

produces glucose

Calvin cycle

In active in the dark

both calvin cycle and light reaction

requires CO2

Calvin cycle

requires glucose

neither light reaction or calvin cycle

requires ADP

light reactions

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