Cell Bio Question

Sure, these animals should help:

<a rel="nofollow" href="https://http://www.shsu.edu/~chm_tgc/sounds/flashfiles/GE.swf" target="_blank">https://http://www.shsu.edu/~chm_tgc/sounds/flashfiles/GE.swf</a>

<a rel="nofollow" href="https://http://oscar.iitb.ac.in/onsiteDocumentsDirectory/Electrophoresis%20Techniques-SDS%20and%20BN-PAGE/Electrophoresis%20Techniques-SDS%20and%20BN-PAGE/Courseassets/glossary.swf" target="_blank">https://http://oscar.iitb.ac.in/onsiteDocumentsDirectory/Electrophoresis%20Techniques-SDS%20and%20BN-PAGE/Electrophoresis%20Techniques-SDS%20and%20BN-PAGE/Courseassets/glossary.swf</a>

<a rel="nofollow" href="https://http://khayma.com/muhannad/flashat/flashat1/instanalysis/04.swf" target="_blank">https://http://khayma.com/muhannad/flashat/flashat1/instanalysis/04.swf</a>

SDS-PAGE is the most widely used method for characterization of proteins and evaluation of their molecular weights and purity. Nearly all proteins are soluble in the presence of the anionic detergent sodium dodecyl sulfate (SDS). SDS binds to proteins with high affinity which confers a negative charge to the polypeptides and relaxes higher order protein structures. Complete disruption of tertiary and quaternary protein structures is essential to achieve protein separation according to molecular weight. This is accomplished by reduction of the inter- and intra-molecular disulfide bonds of polypeptides by the addition of agents such as dithiothreitol (DTT) or 2-mercaptoethanol and subsequent heating.

My prboelm was a wall until I read this, then I smashed it.

Bio_man has everything you need: yet just in case you need MORE:
SDS