NEET BIOLOGY

Detailed explanation-1: -Guanine pairs with cytosine, and adenine pairs with thymine in DNA. Interstrand hydrogen bonds are responsible for this pairing.

Detailed explanation-2: -Guanine binds with cytosine in DNA and RNA and forms three hydrogen bonds. This occurs because guanine has two nitrogen atoms and one oxygen atom that are able to form hydrogen bonds, so three bonds occur between these bases.

Detailed explanation-3: -It is a truth universally acknowledged that a guanine–cytosine (GC) base pair has three hydrogen bonds whereas adenine–thymine (AT) has two.

Detailed explanation-4: -The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.

Detailed explanation-5: -Guanine and cytosine bonded base pairs are stronger then thymine and adenine bonded base pairs in DNA. This difference in strength is because of the difference in the number of hydrogen bonds. This allows researchers to figure out the base content of DNA by observing at what temperature it denatures.