Purines have ring(s), (each) containing nitrogen(s), whereas pyrimidines have ring(s), (each) containing nitrogens.

a) 1; 1; 1; 1
b) 1; 2; 1; 2
c) 2; 1; 1; 2
d) 2; 2; 1; 1
e) 2; 2; 1; 2

E

Explanation: Purines are nitrogenous bases that contains a two-ring carbon structure, with Adenine and Guanine as nitrogenous bases. while pyrimidines has a one-ring carbon structure with Cytosine and Thymine as its nitrogenous base.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

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