The structure of a DNA replication fork is best represented by the following options: A - VCE - SSCE Biology - Question 5 - 2010 - Paper 1

To analyze the structure of a DNA replication fork, we need to understand how DNA strands separate during replication. The replication fork features two strands of DNA: the leading strand and the lagging strand. The leading strand is synthesized continuously in the direction of the fork movement, while the lagging strand is synthesized in short segments called Okazaki fragments, away from the fork.

Among the given options (A, B, C, D), option B accurately reflects the antiparallel nature of the DNA strands and their orientations, showing the appropriate 5' to 3' and 3' to 5' directions characteristic of a DNA replication fork.