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Photochemically generated ATP is consumed in which one of the following phases of Calvin‐Benson cycle?

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CSIR-UGC (NET) Life Science: Held on (17 Feb 2022 Shift 1)
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  1. Only carboxylation
  2. Only regeneration
  3. Carboxylation and reduction
  4. Reduction and regeneration

Answer (Detailed Solution Below)

Option 4 : Reduction and regeneration
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The correct answer is Option 4 i.e. Reduction and regeneration

Key Points

  • The Calvin cycle is a step in the photosynthetic process that converts atmospheric CO2 into sugar phosphates for use in a broader metabolism that supports the growth and development of plants.
  • In the stroma of plant cell chloroplasts, the Calvin cycle occurs.
  • There are eleven enzymes involved in this cycle, which has three stages: 
  1. Carboxylation - carried out by the Rubisco enzyme (ribulose-1,5-bisphosphate carboxylase oxygenase)
  2. Reduction - of the C3 acids produced during the carboxylation reaction (the stage of sugar formation)
  3. Regeneration - of ribulose-1,5-bisphosphate (RUBP), which is the CO2-acceptor molecule of Rubisco enzyme.

Explanation:

  • Reduction and regeneration are the two stages where ATP is consumed as shown in the figure above,
  • Thus option 4 is the correct option and other mentioned options are false.

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