Why Is DNA Said to Be Antiparallel

question 12

Multiple Choice

Why is DNA said to be antiparallel?

• A) The two strands of DNA are joined together via complementary base pairing such that AT run in the 3'5' direction and CG run in the 5'3' direction.
• B) Each strand of the double helix is made up of a sugar phosphate backbone which runs in the 5'3' direction.
• C) DNA has polarity such that one strand runs in the 3'5' direction and the other in the 5'3' direction.
• D) The DNA strands twist into a helix conformation once the bases have joined to form major and minor grooves.

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