1) How are the two DNA strands hold together?
A. Hydrogen bonds between a sugar of the purine with the sugar of the pyrimidine of the two DNA strands
B. Hydrogen bonds between two purine bases of the two strands
C. Hydrogen bonds between two pyrimidine bases of the two strands
D. Hydrogen bonds between a purine of one strand with a pyrimidine of the other
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A.Hydrogen bonds between a sugar of the purine with the sugar of the pyrimidine of the two DNA strands.
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