Multiple choice

Microbes can be preserved for long periods of time by deep-freezing. What is this called as?

  1. Sublimation

  2. Lyophilisation

  3. Methylene blue

  4. Yeast Infusion Broth

  5. Mannitol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Microbes can be preserved for long periods of time by deep-freezing or lyophilisation (freeze-drying). Deep freezing is done quickly, from -50° down to -95°C. Lyophilisation is a quick freeze in which a vacuum pump removes water in a process called sublimation.

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