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Biology 13 Online
OpenStudy (anonymous):

why are the strands of a dna molecule said to be complementary

thomaster (thomaster):

because 1 nucleobase can only form a hydrogen bond with 1 other nucleobase. There are 4 nucleobases so there are 2 pairs: G+C and A+T. When there is a G on the first strand, there will be a C on the other strand at the same place. CTAG will be complementary to GATC. Check the attached image.

OpenStudy (beccaboo333):

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