What is meant by the description "antiparallel" regarding the strands that make up DNA?
a. Base pairings create unequal spacing between the two DNA strands.
b. The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
c. The twisting nature of DNA creates nonparallel strands.
d. One strand contains only purines and the other contains only pyrimidines.
Answer: b. The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
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