Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

4. Both A and B

Explanation:

A chemical substance or toxins produced by organisms such as bacteria or fungi is used to kill or reduce the growth of other pathogenic organisms such as bacteria and fungi, known as an antibiotic. It interferes with a particular step of cellular metabolism, causing either bactericidal or bacteriostatic inhibition. These are also called antimicrobial agents. Certain antibiotics destroy the bacteria and fungi by the disintegration of the bacterial and fungal cell walls. Some of the antibiotics inhibit DNA replication or translation of proteins.