Photosynthesis

AP Biology· difficulty 3/5

Researchers find that supplying isolated chloroplasts with CO2 in the dark fails to produce G3P even when the enzymes of the Calvin cycle are active.

What is the best explanation?

A
$The Calvin cycle requires ATP and NADPH that are produced only by light reactions$
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B
$G3P inhibits its own production at night$
C
$Carbon dioxide cannot diffuse in darkness$
D
$Rubisco can only function in light$

Explanation

The Calvin cycle is light-independent in name but depends on ATP and NADPH from the light reactions to reduce 3-PGA to G3P and regenerate RuBP.

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