High School

2. What process occurs during the light-independent reactions of photosynthesis?

A. Oxygen is released into the atmosphere
B. Protons are pumped from the thylakoid space into the stroma
C. RuBP is carboxylated then regenerated in the Calvin cycle
D. Triose phosphate is converted into G3P

Answer :

Final answer:

The process that occurs during the light-independent reactions of photosynthesis, also known as the Calvin cycle, is the carboxylation of RuBP followed by its regeneration.

Explanation:

During the light-independent reactions of photosynthesis, also known as the Calvin cycle, several key processes occur:

  1. Carbon Fixation: In this step, an enzyme called RuBisCO catalyzes the reaction between carbon dioxide and a five-carbon molecule called RuBP (ribulose-1,5-bisphosphate). This results in the formation of a six-carbon molecule, which is then broken down into two molecules of 3-phosphoglycerate (3-PGA).
  2. Reduction: ATP and NADPH, which are produced during the light-dependent reactions, are used to convert 3-PGA into glyceraldehyde-3-phosphate (G3P).
  3. Regeneration: Some of the G3P molecules are used to regenerate RuBP, allowing the cycle to continue.

Overall, the light-independent reactions of photosynthesis involve the conversion of carbon dioxide into glucose through a series of enzymatic reactions in the stroma of the chloroplasts.

Learn more about photosynthesis here:

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