The GATE Grind

GATE 2024 ES – Question 44

Environmental Microbiology · Growth and Control of Microorganisms · 2 marks · Multiple select

Which disinfection statements are correct?

  1. Ethanol damages bacterial membrane lipids.
  2. Mercuric chloride inactivates sulfhydryl-containing enzymes.
  3. Glutaraldehyde inactivates protein.
  4. Isopropyl alcohol cannot disinfect.

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Show answer and explanation

Correct answer: (A) Ethanol damages bacterial membrane lipids.; (B) Mercuric chloride inactivates sulfhydryl-containing enzymes.; (C) Glutaraldehyde inactivates protein.

Explanation

Alcohols disrupt membrane structures and denature proteins. Mercury compounds bind sulfhydryl groups and impair enzyme function. Glutaraldehyde crosslinks/inactivates proteins. Isopropyl alcohol is a disinfectant, so the prohibition in D is false. Select **A, B, C**.

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