Question

question 19 of 30 > in this figure, which molecules are purines? a) molecular - structure - a b) molecular - structure - b c) molecular - structure - c d) molecular - structure - d

Explanation:

Purines are nitrogen - containing bases with a double - ring structure. Options A and B show double - ring structures characteristic of purines (adenine and guanine are common purines with such structures). Options C and D have single - ring structures which are characteristic of pyrimidines.

Answer:

A. The molecule in option A, B. The molecule in option B