High School

During the Calvin cycle, what happens during the carbon fixation phase?

a) The Calvin cycle incorporates each CO2 molecule, one at a time, by attaching it to a 5-carbon sugar (RuBP).
b) G3P is produced.
c) ATP is produced.
d) RuBP is regenerated.
e) NADPH is produced.

Answer :

Final answer:

During the carbon fixation phase of the Calvin cycle, CO2 is incorporated into a 5-carbon sugar called RuBP. The cycle uses ATP and NADPH to b) produce G3P and d) regenerate RuBP.

Explanation:

During the carbon fixation phase of the Calvin cycle, each CO2 molecule is incorporated by attaching it to a 5-carbon sugar called RuBP. This process is catalyzed by an enzyme called RuBisCO.

The Calvin cycle requires ATP and NADPH, which are produced in the light-dependent reactions, to convert CO2 into glyceraldehyde-3-phosphate (G3P).

One molecule of G3P is produced during each turn of the Calvin cycle. Some of the G3P molecules are used to form glucose, while the rest are used to regenerate RuBP, enabling the cycle to continue.

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