Insertion Mutations in Gene Expression — NEET Biology
📚 Practice ConceptNow we insert three letters together, say BIG, the statement would read
Assertion (A): Different base pairs in DNA are held together by different numbers of hydrogen bonds. Reason (R): Adenine-Thymine pairs have three hydrogen bonds while Guanine-Cytosine pairs have two hydrogen bonds.
View solution & NCERT explanation
Correct answer: C — If assertion is true but reason is false.
NCERT confirms different base pairs have different hydrogen bond numbers, making the Assertion true. However, NCERT states “Adenine forms two hydrogen bonds with Thymine” and “Guanine is bonded with Cytosine with three H-bonds” - the Reason reverses these numbers, making it false.
What does NCERT say about Now we insert three?
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.