Question

Match column I (enzymes) column II (phases/steps of dark reaction) (PGA -Phosphoglyceric acid, G3P - glyceraldehyde-3-phosphate, DHAP-Dihydroxyacetone phosphate, PEP -Phospho enol Pyruvate)

	Column I		Column II
a.	RuBisCO.	i.	Addition of iP to 3-PGA
b.	Phosphoglycerate kinase	ii.	Addition of $C{O}_2$ to PEP
c.	Triose phosphate isomerase.	iii.	Fixation of $C{O}_2$
d.	PEP carboxylase	iv.	Conversion of DHAP to G3P

• A. a-iii, b-ii, c-i, d-iv
• B. a-iii, b-i, c-iv, d-ii
• C. a-ii, b-iv, c-i, d-iii
• D. a-i, b-iii, c-ii, d-iv

Answer 1

Answer: (B)

a-iii, b-i, c-iv, d-ii

RuBisCO (Ribulose-1,5 Bisphosphate Carboxylase Oxygenase) is an enzyme that brings about carboxylation of Ribulose -1, 5 bisphosphate by addition of $C{O}_2$ molecule to it.

Phosphoglycerate kinase is an enzyme that adds an iP group to 3-PGA to form 1,3 bisphosphoglyceric acid.

Triose phosphate isomerase catalyzes a reversible conversion of DHAP to G3P

PEP carboxylase catalyzes the addition of $C{O}_2$ molecule to Phospho enol pyruvate in $C_4$ cycle.

So, the correct answer is 'a-iii, b-i, c-iv, d-ii'