The 4-amino or 4-keto group of pyrimidine bases is located

Home » Biomolecules : Constituents of Life » Biomolecules Constituents of Life Miscellaneous » Question

The 4-amino or 4-keto group of pyrimidine bases is located in the

1. major groove of the double stranded DNA
2. minor groove of the double stranded DNA
3. minor groove of the B form DNA but not the A form DNA
4. major groove of the B form DNA but not the A form DNA

Correct Option: A

The pyrimidine bases, Thymine and Cytosine in case of DNA have a 4-amino or a 4-keto group present with the amide ring. These 4-amino or 4-keto groups are present in the major groove of the DNA molecule.