Which of the following are compounds called purines?
1) Adenine and cytosine
2) Adenine and guanine
3) Adenine and thymine
A) 1 only
B) 2 only
C) 3 only
D) 1,2,and 3
Correct Answer:
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Q18: Adenine bonds only with
A)cytosine.
B)guanine.
C)hydrogen.
D)thymine.
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