The antiparallel arrangement within DNA molecules refers to
A. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.
B. a purine always bonding to a pyrimidine.
C. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
D. each base bonding at the 1' position of the sugar.
Answer: A
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