Gene Inactivation and Recombinant Selection — NEET Biology
🔥 Predicted for NEET 2027Gene gets 'inactivated due to insertion' of alien DNA, and helps in selection of recombinants.
Adjacent to a frequently-asked paragraph in the same chapter.
Plasmid pBR322 has a PstI restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactosidase production and the recombinant plasmid is inserted in an E. coli strain: (NEET 2021)
View solution & NCERT explanation
Correct answer: C — It will not be able to confer ampicillin resistance to the host cell.
Insertion in the ampR gene disrupts its function, so the recombinant plasmid no longer provides resistance to ampicillin.
What does NCERT say about Gene gets inactivated due?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.