Action of bacterial antibiotics sulpha drugs is due to

Options

A. Competitive inhibition
B. Reversible competitive inhibition
C. Irreversible non competitive inhibition
D. Feed back inhibiiton

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the action of bacterial antibiotics, specifically sulpha drugs, and what mechanism is responsible for their effectiveness.

2. **Identifying the Mechanism**: The action of sulpha drugs is primarily due to a process known as **competitive inhibition**. This means that sulpha drugs compete with the natural substrate for binding to the active site of an enzyme.

3. **Explaining Competitive Inhibition**: In competitive inhibition, the sulpha drug (the competitive inhibitor) competes with the substrate (the natural molecule that the enzyme acts upon) to bind to the enzyme's active site. When the sulpha drug binds to the active site, it prevents the substrate from binding, thus inhibiting the enzyme's activity.

4. **Consequences of Competitive Inhibition**: By blocking the substrate from binding, the sulpha drugs effectively stop the biochemical reactions that the enzyme would normally catalyze. This is particularly important in bacterial cells, as it can halt processes necessary for their growth and survival.

5. **Conclusion**: Therefore, the action of bacterial antibiotics like sulpha drugs is due to **competitive inhibition**.

6. **Final Answer**: The correct answer is **option A: Competitive Inhibition**.

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