Question

In calvin cycle, the fixation of CO2 into a stable organic intermediate is called...

• A. Carboxylation
• B. Decarboxylation
• C. Kreb's Cycle
• D. Electron Transport

Answer 1

The correct option is A Carboxylation

The first step of the Calvin cycle is Carboxylation, where CO${}_2$ is fixed into a stable organic intermediate. During the process, CO${}_2$ is used for the carboxylation of RuBP, via RuBP carboxylase as the catalyst and resulting in the formation of two molecules of 3-PGA.

So the correct option is 'Carboxylation'