Question

The pyrimidine bases present in DNA are:

• A. Cytosine and Uracil
• B. Cytosine and Thymine
• C. Cytosine and Guanine
• D. Cytosine and Adenine

Hint:

Remember: DNA has Thymine (T), while RNA has Uracil (U). Pyrimidines include Cytosine, Thymine (in DNA), and Uracil (in RNA).

Answer 1

The Correct Option is B

Nucleic acids such as DNA and RNA are made up of nitrogenous bases, which are classified into two categories:

• Purines: Adenine (A) and Guanine (G)
• Pyrimidines: Cytosine (C), Thymine (T), and Uracil (U)

In DNA:

• The pyrimidines present are Cytosine (C) and Thymine (T)
• Uracil (U) is not found in DNA; it is found in RNA instead

Hence, the correct pair of pyrimidine bases present in DNA is: \[ \boxed{\text{Cytosine and Thymine}} \]