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a) Antibiotics are classified into broad-spectrum antibiotics and narrow-spectrum antibiotics. Write one example each for these antibiotics.

b) Write one similarity and one difference between antiseptics and disinfectants.

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a) Broad-spectrum antibiotic – Chloramphenicol Narrow 

spectrum antibiotic – Penicillin G

b) Similarity

Both are chemicals which either kill or prevent the growth of microorganisms.

Difference
Antiseptics are applied to the living tissues such as wounds, cuts, ulcers and diseased skin surfaces. Disinfectants are applied to inanimate objects such as floors, drainage syste, instruments, etc.

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