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Biomolecules
Nucleic Acids: Base Pairing
1 question from 1 paper, each with its answer.
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Concepts tested
- Complementary base pairing
All Questions
2001 AIPMT 1 question
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Which of the following is correct about H-bonding in nucleotides : -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.