Help with Light Reactions - GRE Subject Test: Biochemistry, Cell, and Molecular Biology
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Which molecule transfers electrons from photosystem II to photosystem I?
Which molecule transfers electrons from photosystem II to photosystem I?
Photosystems I and II are each capable of conducting electrons, with photosystem II handing off electrons to photosystem I. This is accomplished by the electron carrier molecule plastocyanin.
Photosystems I and II are each capable of conducting electrons, with photosystem II handing off electrons to photosystem I. This is accomplished by the electron carrier molecule plastocyanin.
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Which product is made in photosystem I?
Which product is made in photosystem I?
Photosystems I and II are responsible for the light-dependent reactions of photosynthesis. These two photosystems work in tandem to create ATP and NADPH products. ATP is created in photosystem II, while NADPH is created in photosystem I.
Photosystems I and II are responsible for the light-dependent reactions of photosynthesis. These two photosystems work in tandem to create ATP and NADPH products. ATP is created in photosystem II, while NADPH is created in photosystem I.
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What fuels ATP synthase to make ATP from ADP + Pi in the light reaction of photosynthesis?
What fuels ATP synthase to make ATP from ADP + Pi in the light reaction of photosynthesis?
Excitation of photosystem II splits water in the thylakoid space into hydrogen and oxygen. The hydrogen then passes through ATP synthase to move down its concentration gradient and into the stroma. Excitation of photosystem I passes electrons to NADP+ reductase to convert NADP+ to NADPH. Regeneration of NADPH is necessary for the Calvin cycle.
Excitation of photosystem II splits water in the thylakoid space into hydrogen and oxygen. The hydrogen then passes through ATP synthase to move down its concentration gradient and into the stroma. Excitation of photosystem I passes electrons to NADP+ reductase to convert NADP+ to NADPH. Regeneration of NADPH is necessary for the Calvin cycle.
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During the photosynthetic light reactions, which of the following molecules acts as the electron acceptor?
During the photosynthetic light reactions, which of the following molecules acts as the electron acceptor?
Electrons excited in photosystem I are accepted by 
, thus converting 
to 
. 
is the reduced form of 
and while 
acts as an electron acceptor in certain reactions, the light reactions utilize 
which has an extra phosphate. 
and 
are not used to accept electrons in this context.
Electrons excited in photosystem I are accepted by
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