Funding provided by grant 51006109 from the Howard Hughes Medical Institute, Precollege Science Education Initiative for Biomedical Research.
Paul Andersen explains how genes are regulated in both prokaryotes and eukaryotes. He begins with a description of the lac and trp operon and how they are used by bacteria in both positive and negativ
Some genes turn other genes on and off. In this slide show, see how powerful these gene switches can be.
Genes are best known as the instructions for building proteins. However, only a portion of the nucleotides in a gene actually code for the protein itself. Other parts of the gene provide additional in