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Biology 5 Online
OpenStudy (anonymous):

Why are the strands of DNA said to be complementary to each other? A) The sugar-phosphate chains are running in opposite directions. B) The sugar-phosphate chains of each strand are identical. C) Both strands can have any of four possible bases attached. D) All the bases of one strand are paired up with their complementary bases on the other strand.

OpenStudy (anonymous):

D) All the bases of one strand are paired up with their complementary bases on the other strand.

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