The Health Sciences department in the University of Utah has a lovely website explaining many aspects of biology and molecular biology through videos and interactive animations. The home page is here : http://learn.genetics.utah.edu/ with lots of links to explore but I’ve put together some of the most relevant pages below.

• Transcribing and Translating a Gene
  • http://learn.genetics.utah.edu/content/molecules/transcribe/
• Single Nucleotide Polymorphism (SNP) 
  • http://learn.genetics.utah.edu/content/precision/snips/
• PCR
  • http://learn.genetics.utah.edu/content/labs/pcr/
• What is a Protein?
  • http://learn.genetics.utah.edu/content/molecules/proteins/
• What is a Gene?
  • http://learn.genetics.utah.edu/content/molecules/gene/
• What is DNA?
  • http://learn.genetics.utah.edu/content/molecules/dna/
• Transgenic Mice
  • http://learn.genetics.utah.edu/content/science/transgenic/
• Measuring Gene Expression
  • http://learn.genetics.utah.edu/content/science/expression/