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NEET 2017 · BiologyPrevious Year Question

A gene whose expression helps to identify transformed cell is known as

Answer: (A) Selectable marker. Answer: (A) Selectable marker Solution: A selectable marker is a gene carried by the vector that helps identify and eliminate non-transformants while selectively permitting growth of transformed cells; genes for antibiotic resistance (e.g.

  1. A.Selectable marker✓
  2. B.Vector
  3. C.Plasmid
  4. D.Structural gene

Correct Answer

(A) Selectable marker

Solution & Explanation

Answer: (A) Selectable marker Solution: A selectable marker is a gene carried by the vector that helps identify and eliminate non-transformants while selectively permitting growth of transformed cells; genes for antibiotic resistance (e.g. ampicillin, tetracycline) are commonly used as selectable markers in E. coli. A vector or plasmid is the carrier DNA itself, and a structural gene encodes a product but does not by itself report transformation. NCERT Reference: Ch 9, p.169, line(s) 13-16 — "selectable marker, which helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants."

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