Question

How many ATP is needed to generate one molecule of RuDP in Clavin Cycle?

• A. 6
• B. 2
• C. 1
• D. 18

Answer 1

The correct option is A 6

There are three steps involved in the Calvin cycle: carbon dioxide fixation, reduction, and regeneration. Regeneration of RuBP is the last step during this cycle. ATP is used in the regeneration of RuBP. In general, six turns of the Calvin cycle are needed to fix six carbon atoms from CO2. These six turns require energy input from 12 ATP molecules and 12 NADPH molecules in the reduction step and 6 ATP molecules in the regeneration step. So, the regeneration of RuBP requires 6 ATP. So, the correct option is '6'.