|MadSci Network: Microbiology|
All things that are living require a few things in order to grow. 1. A source of nutrients 2. proteins that allow them to convert those nutrients into useful energy and building blocks. 3. proteins that convert these building blocks into other proteins, and DNA/RNA 4. a way to get rid of waste products, waste products are toxic to the organiism if they are not removed somehow. So essentially how E.coli grows is that it uptakes nutreints from the environment. After taking up these nutrients it converts them into energy and building blocks. The availability of these building blocks allow it to build other proteins and such, as well as allow it to make copies of its DNA with proteins that it has that help do these things. After the cell has finished copying its DNA it divides with the help of proteins that specialize in this activity, using energy from the nutrients it took up from the environment. Now it has gone from bein one cell to two. Of course the E. coli is always taking up nutrients ans getting rid of waste products, and thus is able to keep growing. Best Wishes, David Beck
Try the links in the MadSci Library for more information on Microbiology.