Labels:text | font | black and white | screenshot | white | typography OCR: At any given time, an organism expresses only a fraction of the genetic information it stores. For example, bacteria efficiently turn on genes that code for products required to meet specific nutritional needs, while at the same time turning off nonessential genes. In multicellular eukaryotes, different cell types containing identical sets of genes have distinctive properties because they express different proteins. Thus, cells must have regulatory mechanisms that enable them to selectively express particular genes at the appropriate time and place. Elucidation of these mechanisms is a central goal of genetics
