Q.What are antibiotics? Write down the names of two antibiotics.

Antibiotics inhibit or kill micro-organisms; examples are penicillin and streptomycin.

Antibiotics are chemical substances produced wholly or partly by micro-organisms (or made synthetically) that, even in low concentration, either kill micro-organisms (bactericidal) or prevent their growth (bacteriostatic) without being seriously toxic to the host.

Examples:

• Penicillin - the first antibiotic, discovered by Alexander Fleming; bactericidal. …