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STD 12 - 7. human health and disease — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 7. human health and disease1 Mark
MCQ
Common cold is not cured by antibiotics because it is
  • ✓
    caused by a virus
  • B
    caused by a Gram­positive bacterium
  • C
    caused by a Gram­negative bacterium
  • D
    not an infectious disease.
✓

Answer

Correct option: A.
caused by a virus
a
(a) : Common cold is caused by some $100$ types of Rhino viruses. It is one of the most common infectious disease in human. Antibiotics are substances that destroy or inhibit the growth of microorganisms, particularly disease­producing bacteria and fungi. Antibiotics are obtained from microorganisms (especially moulds) or synthesized. Many antibiotics interfere with the pathogen protein synthesis. Some ($e.g.$ Penicillin) prevent cross­linking of the glycan chains of peptidoglycan molecules in bacterial cell walls. Since the viruses do not possess cell wall and their own protein synthesising apparatus, they are not attacked by antibiotics.

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