Читать книгу Snyder and Champness Molecular Genetics of Bacteria - Tina M. Henkin - Страница 166

Proteins do most of the work of the cell. While there are a few RNA enzymes (ribozymes), most of the enzymes that make and degrade energy sources and make cell constituents are proteins. Also, proteins contribute to much of the structure of the cell. Because of these diverse roles, there are many more types of proteins than there are types of other cell constituents. Even in a relatively simple bacterium, there are thousands of different types of proteins, and most of the DNA sequences in bacteria are dedicated to genes that encode proteins.