Question

In Calvin cycle, if one molecule of RuBP is carboxylated than how many PGA molecule will be formed?

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

Answer: (A)

Carboxylation of one molecule of RuBP leads to the formation of $2$ molecules of $3-PGA$.
$RuBP+C{O}_2\underset{\text{ carboxylase }}{\overset{RuBP}{\to }}2$-carboxyl $3$-keto $1-5$, bisphosphoribotol
$2$-carboxyl $3$-keto $1-5$-bisphosphoribotol $+H_{2}O⟶2\text{ (3PGA) }$