Question

Choose the correct answer from the alternatives given.
The pyrimidines of DNA are represented by:

• A. Uracil and guanine
• B. Thymine and cytosine
• C. Adenine and cytosine
• D. Adenine and guanine

Answer 1

Answer: (B)

Thymine and cytosine

DNA or deoxyribonucleic acid is the main genetic material of most of the living organism. It consists of three main parts, namely deoxyribose sugar, nitrogenous bases and a phosphate molecule.

The nitrogenous bases include adenine, guanine, cytosine and thymine in the case of DNA.

Adenine and guanine form the purines whereas the cytosine and thymine form the pyrimidines.

Uracil is present in RNA that replaces thymine.

So, the correct option is 'Thymine and cytosine'.