Complementary base pairing
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cytosine always pairs with ... and there are ... hydrogen bonds between them
guanine; three
The two antiparallel DNA strands are joined together by ... bonds between the nitrogenous bases
hydrogen
Purines are ... in size than pyrimidines
larger
How many rings do pyrimidines have?
one
Which bases are pyrimidines?
thymine and cytosine
adenine always pairs with ... and there are ... hydrogen bonds between them
thymine; two
How many rings do purines have?
two
Which bases are purines?
adenine and guanine
