NEET 2012 · Class 12

Biotechnology: Principles and Processes

29. In genetic engineering, the antibiotics are used

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

The NCERT line that answers it

Verbatim line

The ampicillin resistance gene in this case is called a **selectable marker**.

Chapter
Biotechnology: Principles and Processes
Section
9.3.4 Insertion of Recombinant DNA into the Host Cell/Organism
Page
12
Words matched
12 of 12

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

2, emb=1.0, combined=0.68). Verified: high — The span explicitly states that the ampicillin resistance gene is called a selectable marker, which directly matches option A and distinguishes it from the other options.

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