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12.1: Activity: Griffith's experiments

Review Griffith's experiments showing that a harmless strain of R bacteria could be transformed into deadly strain S bacteria.

12.2: Tutorial: The Hershey-Chase experiment

This tutorial explores an elegant experiment designed to test which substance—DNA or protein—was the genetic material.

12.3: Activity: Building a DNA strand

Simulate the process of building a new DNA strand.

12.4: Tutorial: DNA replication

This tutorial reviews the simple base-pairing rules that allow the information in one strand of DNA to be used to generate a new strand.

12.5: Tutorial: DNA repair

This tutorial explores how cells detect and repair replication errors.

12.1a: Process Animation: VDNA Repair: Mutations from DNA Replication

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12.1b: Process Animation: Mutations from Sunlight

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12.2: Process Animation: The Hershey-Chase experiment

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