Which of the following drugs acts by inhibiting DNA dependant RNA synthesis in mycobacteria?
**Core Concept**
Mycobacteria, such as those causing tuberculosis (TB), require a unique set of mechanisms to replicate and survive. Inhibiting DNA-dependent RNA synthesis is a crucial step in controlling bacterial growth, particularly in the context of mycobacterial infections.
**Why the Correct Answer is Right**
The correct answer acts by inhibiting RNA polymerase, the enzyme responsible for transcribing DNA into RNA. This process is essential for protein synthesis and bacterial replication. The correct answer specifically targets mycobacteria, which makes it an effective treatment for TB and other mycobacterial infections.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it targets a different enzyme involved in bacterial cell wall synthesis, not DNA-dependent RNA synthesis.
**Option B:** This option is incorrect because it inhibits protein synthesis by binding to bacterial ribosomes, not by affecting DNA-dependent RNA synthesis.
**Option C:** This option is incorrect because it targets the bacterial cell membrane, not the DNA-dependent RNA synthesis process.
**Clinical Pearl / High-Yield Fact**
In the context of TB treatment, a combination of drugs is often used to target different aspects of bacterial replication, including DNA-dependent RNA synthesis, cell wall synthesis, and protein synthesis.
**Correct Answer:** C. Rifampicin