Statins act by competitively inhibiting H-M-G-CoA reductase, the key enzyme in cholesterol biosynthesis.
This is a high-yield medical and biological mechanism frequently tested in competitive exams.
Step 1: Understanding the Question:
The question requires matching industrially useful biochemicals (Column-I) with their corresponding microbial sources (Column-II).
Step 2: Key Concepts and Approach:
Microorganisms like fungi, bacteria, and yeasts are exploited industrially to produce organic acids, bioactive molecules, and pharmaceuticals.
We link each metabolite to the species that synthesizes it.
Step 3: Detailed Explanation:
• A $\rightarrow$ IV (Butyric acid - Clostridium): Butyric acid is an organic acid produced through anaerobic fermentation by the bacterium Clostridium butylicum.
• B $\rightarrow$ III (Citric acid - Aspergillus): Citric acid is produced commercially via aerobic fermentation using the filamentous fungus Aspergillus niger.
• C $\rightarrow$ II (Cyclosporin-A - Trichoderma): Cyclosporin-A is a powerful immunosuppressive drug used to prevent organ rejection in transplant patients.
It is harvested from the fungus Trichoderma polysporum.
• D $\rightarrow$ I (Statin - Monascus): Statins are blood cholesterol-lowering agents that competitively inhibit the rate-limiting enzyme of cholesterol synthesis.
They are produced by the yeast Monascus purpureus.
Step 4: Final Answer:
Matching the columns yields the sequence A-IV, B-III, C-II, D-I.
