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25 Cards in this Set

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

ATP and NADPH

Where does the Calvin cycle take place?

stroma of the chloroplast

During photosynthesis, visible light has enough energy to .

excite electrons.

The reaction-center chlorophyll of photosystem I is known as P700 because .

this pigment is best at absorbing light with a wavelength of 700 nm.

Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be

to test for liberation of O2 in the light.

What does cyclic electron flow in the chloroplast produce?

ATP

What does the chemiosmotic process in chloroplasts involve?

establishment of a proton gradient

In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

the stroma to the thylakoid space.

synthesis of ATP by the chemiosmotic mechanism

both photosynthesis and respiration

reduction of NADP+

photosynthesis

generation of proton gradients across membranes

both photosynthesis and respiration

What is the primary function of the Calvin cycle?

synthesize simple sugars from carbon dioxide

One carbon dioxide molecule reacts in each "turn" of the Calvin cycle. How many turns of the cycle are required for the synthesis of one glucose molecule?

6

requires ATP

the Calvin cycle alone

produces NADPH

light reactions alone

inactive in the dark

both the light reactions and the Calvin cycle

requires glucose

neither the light reactions nor the Calvin cycle

In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (14(C) dioxide as a metabolic tracer. The 14C is incorporated first into oxaloacetate. The plant is best characterized as a

C4 plant.

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

fix CO2 into organic acids during the night.

Carbon fixation involves the addition of carbon dioxide to

RuBP.

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

H2O à NADPH à Calvin cycle

In what respect are the photosynthetic adaptations of C4 plants and CAM plants similar?

In both cases, an enzyme other than rubisco carries out the first step in carbon fixation.

Which of the following statements about the light reactions of photosynthesis are true?

The splitting of water molecules provides a source of electrons. --Chlorophyll (and other pigments) absorb light energy, which excites electrons. --ATP is generated by photophosphorylation.

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.

What did Engelmann conclude about the congregation of bacteria in the red and blue areas?

Bacteria congregated in these areas because these areas had the most oxygen being released.

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.

If you ran the same experiment without passing light through a prism, what would you predict?

The bacteria would be relatively evenly distributed along the algal filaments.