Molecular (Biology)
Lineweaver-Burke and inhibitors 
This is a nice complete explenation about inhibitors and its effects on Km and Vmax. The writing is easy to understand and logical. It also has a little java applet that shows the changes in the Lineweaver-Burke when changing Km and Vmax.
DNA Transcription
Short animation rich with information about DNA transcription. This definitely helped me out in a bunch of my biology courses. Reading your textbook beforehand is a plus, but definitely not needed to understand the basic concept.
Voltage Gated Sodium Channels
These are the same sodium channels found specifically in the nerves but also in other cells. It is an easy read with great images and animations.
enzyme inhibitors
A simple explanation of competitive and non-competitive enzyme inhibitors. I was going to post this link under biochemistry but it is definitely written by a biologist. It is definitely written in an easy to understand way. This review covers competative, and non-competative inhibitors. Michaelis-...
G-protein coupled receptor video
This video explains the process of cellular signaling through G-protein-coupled receptors. This is a nice overview of GPCR's.
Basic Protein Folding Processes on Wolfram
Very cool demonstration on how protein folding occurs. You can change the two torsion angles and see how the rest of the molecule moves in concert. From the page: This Demonstration presents a simplified schematic representation of the possible motions of a protein chain. Two amino-acid units, with...
Replicative Transposition Animation
Really cool animation that helped me understand transposition. This animation gives you the option to choose between wild-type or mutant pathways. This animation shows the transposition of the E.coli Tn3 transposon.
Regulated Transcription: The Movie
Gene expression is controlled in many different ways. When proteins from outside a cell signal for a specific gene to be transcribed, it is known as regulated transcription. This animation illustrates how a protein like insulin can trigger a regulated transcription event, in addition to setting off...
Protein Synthesis
Protein Synthesis, Translation Translation - the process of converting the mRNA codon sequences into an amino acid polypeptide chain. 1. Initiation - A ribos......
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