This topic is well-resourced on the internet – almost too well! Standard level students need to know the bare basics, which equates to the process of replication of the leading strand for the HL students. Here is the presentation, with some good links to follow:

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DNA Replication animations:

St. Olaf’s nice and clear animation.

Another clear one from Wiley.

Nicely illustrated one from Harvard.

John Kyrk’s complicated molecular animation.

The Meselsohn Stahl experiment from Sumanas.

More animations from North Harris College and from LearnersTV.

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Revision materials:

Click4Biology pages: Core & HL

Wikipedia page

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Here is the top-rated video on the subject on YouTube: