The presence of Okazaki fragments demonstrates the antiparallel nature of the double helix.

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Okazaki fragments are short DNA fragments that are found on the lagging strand during DNA replication. The lagging strand has to be synthesized in loops, producing Okazaki fragments, because it runs in the opposite direction of the replication fork. This is because the double helix of DNA is antiparallel - one strand runs in the 5' to 3' direction while the other runs in the 3' to 5' direction. Therefore, the presence of Okazaki fragments is evidence of the antiparallel nature of the double helix.

The Presence of Okazaki Fragments Demonstrates the Antiparallel Nature of the Double