Multiple choice

Microbes can be preserved for long periods of time by deep-freezing called

  1. sublimation

  2. lyophilization (freeze-drying)

  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 lyophilization (freeze-drying). Deep freezing is done quickly, from -50° down to -95°C. Lyophilization is a quick freeze in which a vacuum pump removes water in a process called sublimation.

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