The light reactions of photosynthesis supply the Calvin cycle with
A. light energy
B. CO2 and ATP
C. H2O and NADPH
D. ATP and NADPH
E. sugar and O2
D. ATP and NADPH
Which of the following sequences correctly represents the flow of electrons during photosynthesis?
A. NADPH -> O2 -> CO2
B. H2O -> NADPH -> Calvin cycle
C. NADPH -> chlorophyll -> Calvin cycle
D. H2O -> photosystem I -> photosystem II
E. NADPH -> electron transport chain -> O2
B. H2O -> NADPH -> Calvin Cycle
Which of the following conclusions does not follow from studying the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis?
A. Not all wavelengths are equally effective for photosynthesis
B. There must be accessory pigments that broaden the spectrum of light that contributes to photosynthesis.
C. The red and clue areas of the spectrum are most effective in driving photosynthesis.
D. Chlorophyll owes its color to the absorption of green light.
E. Chlorophyll a has two absorption peaks.
D. Chlorophyll owes its color to the absorption of green light.
Cooperation of the two photosystems is required for
A. ATP synthesis
B. reduction of NADP+
C. cyclic photophosphorylation
D.oxidation of the reaction center of photosystem I.
E. generation of a proton-motive force.
B. reduction of NADP+
In mechanism, photophosphorylation is most similar to
A. substrate-level phosphorylation in glycolysis.
B. oxidative phosphorylation in cellular respiration.
C. the Calvin cycle
D. carbon fixation
E. reduction of NADP+
B. oxidative phosphorylation in cellular respiration.
In what respect are the photosynthetic adaptations of C4 plants and CAM plants similar?
A. In both cases, only photosystem I is used.
B. Both types of plants make sugar without the Calvin cycle.
C. In both cases, an enzyme other than rubisco carries out the first step in carbon fixation.
D. Both types of plants make most of their sugar in the dark.
E. Neither C4 nor CAM platens have thylakoids.
C. In both cases, an enzyme other than rubisco carries out the first step in carbon fixation.
Which of the following processes is most directly driven by light energy?
A. creation of a pH gradient by pumping protons across the thylakoid membrane
B. carbon fixation in the stroma
C. reduction of NADP+ molecules
D. removal of electrons from chlorophyll molecules
E. ATP synthesis
D. removal of electrons from chlorophyll molecules
Which of the following statements is a correct distinction between cyclic and noncyclic electron flow?
A. Only noncyclic electron flow produces ATP.
B. In addition to ATP, cyclic electron flow also produces O2 and NADPH.
C. Only cyclic electron flow utilizes light as 700 nm.
D. Chemiosmosis is unique to noncyclic electron flow.
E. Only cyclic electron flow can operate in the absence of photosystem II.
E. Only cyclic electron flow can operate in the absence of photosystem II.
Which of the following statements is a correct distinction between autotrophs and heterotrophs?
A. Only heterotrophs require chemical compounds form the environment.
B. Cellular respiration is unique to heterotrophs.
C. Only heterotrophs have mitochondria.
D. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
E. Only heterotrophs require oxygen.
D. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
Which of the flowing does not occur during the Calvin cycle?
A. carbon fixation
B. oxidation of NADPH
C. release of oxygen
D. regeneration of the CO2 acceptor
E. consumption of ATP
C. release of oxygen
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