Question

Regeneration of four molecules of $RuBP$ in $C_3$ cycle requires the expenditure of ________$ATP$.

• A. $1$
• B. $4$
• C. $3$
• D. $2$

Answer 1

The correct option is B $4$

This will, of course, require an ATP to add the second phosphate, and more than one PGAL to give the total of five carbons found in RuBP. So the correct option is '4’.