Question

which of these is(are) pyrimidines? a b c d e b and c c, d, and e b, c, and d a and b a, b, and c

Explanation:

Pyrimidines are nitrogen - containing bases with a single - ring structure. Adenine (A) and Guanine (G) are purines (double - ring structure). Cytosine (C), Thymine (T), and Uracil (U) are pyrimidines. Looking at the structures:

• Structure A is a purine (double - ring).
• Structure B is a purine (double - ring).
• Structure C is a pyrimidine (single - ring).
• Structure D is a pyrimidine (single - ring).
• Structure E is a pyrimidine (single - ring).

Answer:

C, D, and E