Complementary is the term we use in to describe the structure of DNA.
leading strand
DNA is made differently on the two strands at a replication fork. One new strand, the leading strand, runs 5' to 3' towards the fork and is made continuously. The other, the lagging strand, runs 5' to 3' away from the fork and is made in small pieces called Okazaki fragments.
DNA are double stranded one strand is parallel and other is antiparallel strand . In which the base pairs are complementary to each other
To learn more about DNA strands refer
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