Describe how TB is passed on.
Streptomycin was the first antibiotic used to treat TB. In the first few years after streptomycin treatment was introduced, more and more $M.\ tuberculosis$ bacteria became resistant to streptomycin. Outline how this happened.
Explain the meaning of transcription.
M. tuberculosis and humans both use RNA polymerase for transcription. Suggest why rifampicin has no effect on transcription in human cells.
Other drugs such as isoniazid are also used in the treatment of TB. Some bacteria are now resistant to more than one of these drugs. These bacteria are called multi-drug resistant (MDR) bacteria. Outline the steps that can be taken to lessen the impact of drug resistance in bacteria.
Explain why antibiotics can be used to treat bacterial infections but not viral infections.