Looking for classes? Ksquare Career Institute, Bengaluru →
Which of the following is correct about H-bonding in nucleotides : -
A
A–T, G–C
B
A–G, T–C
C
G–T, A–C
D
A–A, T–T
Detailed Solution
In DNA, the two strands are held together by hydrogen bonds between complementary bases.
Adenine pairs with thymine through two hydrogen bonds (A=T), and guanine pairs with cytosine through three hydrogen bonds (G$\equiv$C).
A purine always pairs with a pyrimidine, which keeps the width of the double helix constant.
So hydrogen bonding is A–T and G–C.
Adenine pairs with thymine through two hydrogen bonds (A=T), and guanine pairs with cytosine through three hydrogen bonds (G$\equiv$C).
A purine always pairs with a pyrimidine, which keeps the width of the double helix constant.
So hydrogen bonding is A–T and G–C.