Photosynthesis

AP Biology· difficulty 3/5

CO₂ fixation reduction regeneration Calvin cycle

The three phases of the Calvin cycle are

  • A

    Translation, transcription, replication

  • B

    CO₂ fixation, reduction, regeneration of RuBP

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  • C

    Light reactions, dark reactions, photolysis

  • D

    Glycolysis, Krebs, ETC

Explanation

RuBisCO fixes CO₂ onto RuBP → 3-PGA. ATP/NADPH reduce 3-PGA to G3P. Most G3P regenerates RuBP; one in six leaves as a sugar precursor.

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