each type of base on one strand forms a bond with just one type of base on the other strand. this is called complementary base pairing. here, purines form hydrogen bonds to pyrimidines, with a bonding only to t, and c bonding only to g. this arrangement o, each type of base on one strand forms a bond with just one type of base on the other strand. this is called complementary base pairing. here, purines form hydrogen bonds to pyrimidines, with a bonding only to t, and c bonding only to g. this arrangement o

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