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Why is glycerol added to a glycerol stock?

Answer and explanation

Correct answer: To protect cells from freezing damage

Glycerol is added to a glycerol stock because it acts as a cryoprotectant during frozen storage. It helps reduce the formation and harmful effects of ice crystals, limits severe changes in the cell’s surroundings, and improves the chance that cells will remain viable after thawing. Therefore, option A is correct. Glycerol does not cut DNA; that function belongs to restriction enzymes. It does not itself transform a host cell, which requires introducing genetic material by an appropriate method, and it is not added simply to colour proteins. The governing idea is preservation of living cells at low temperature.

Related tags

Glycerol-StockCryoprotectionCell-PreservationBiotechnologyCompetent HostPrinciples Of BiotechnologyClass 11 Mcq

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