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


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