Multiple choice

Most commonly solidifying agent in culture media is

  1. peptone

  2. tryptone

  3. methylene blue

  4. agar

  5. mannitol
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Agar is more often used solidifying agent in culture media. It melts completely at the temperature of boiling water (97-100oC) and solidifies when cooled to about 45oC. It is chemically polysaccharide and is not attacked by bacteria and others microbes growing on it. Agar is obtained from seaweeds(Algae) called kelps.

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