Correct option is D
Explanation-
A. Biosynthesis of two basic five-carbon units
→ Refers to synthesis of IPP (isopentenyl pyrophosphate) and DMAPP (dimethylallyl pyrophosphate)
→ Key enzyme: HMG-CoA synthase (in mevalonate pathway)
Correct match: A – iii
B. Repetitive additions of C₅ units
→ These additions create geranyl (C10), farnesyl (C15), and geranylgeranyl (C20) precursors
→ Catalyzed by prenyltransferases
Correct match: B – iv
C. Formation of the basic terpenoid skeletons
→ Cyclization or rearrangement to form monoterpenes, sesquiterpenes, diterpenes, etc.
→ Catalyzed by terpene synthases
Correct match: C – i
D. Modification of terpenoid skeletons
→ Involves oxidation, hydroxylation, epoxidation, etc.
→ Done by P450 monooxygenases
Correct match: D – ii
Final Answer:
A – iii, B – iv, C – i, D – ii (Option d)
