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In genetic engineering, the antibiotics are used:

  1. A
    To keep the cultures free of infection
  2. B
    As selectable markers
  3. C
    To select healthy vectors
  4. D
    As sequences from where replication starts

Solution & Step-by-step Explanation

Antibiotic resistance genes (like ampR, tetR) are used as selectable markers in vectors to help in identifying and selecting transformants (cells that have taken up the plasmid) from non-transformants.

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In genetic engineering, the antibiotics are used:
A
To keep the cultures free of infection
B
As selectable markers
C
To select healthy vectors
D
As sequences from where replication starts

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