Question

The ratio between 3- carbon and 2- carbon intermediates having -$N{H}_2$ group formed in photosynthetic oxidation cycle is

• A. 1:1
• B. 2:1
• C. 3:2
• D. 3:4

Answer 1

Answer: (B)

2:1

Photorespiration is a process in plant which is otherwise called as photosynthetic oxidation cycle. It attempts to reduce the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO. The ratio between 3-carbon intermediates (serine and glycerate) and 2-carbon (glycine) having NH${}_2$ group formed in photosynthetic oxidation cycle is 2:1.