Q. If recombinant DNA carrying antibiotic resistance ($e.g.,$ ampicillin) is transferred into $E.coli$ cell, the host cell is transformed into ampicillin-resistant cells. The ampicillin resistant gene in this case is called a

A) Vectors
B) Plasmid
C) Selectable marker
D) Cloning sites
Explanation

Gene encoding resistance to antibiotics like ampicillin, chloramphenicol, tetracycline or Kanamycin, are useful selectable markers for E.coli. The normal E.coli cells do not carry resistance against any of these antibiotics

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.