Biology notes on viruses.

Notes pg. 455-461 Biologists first suspected the existence of computer computer viruses nest the end of the ordinal century. At that time, European scientists were seeking to let on the infectious component responsible for tobacco plant mosaic disease, a disease that stunts the gain of tobacco plants and makes their leaves blotchy. One experiment apply fine-pored porcelain filters to strain bacterium from sap extracted from infected tobacco plants. The pores in these filters were so wee that bacteria could not pass by dint of them. However, the infectious instrument passed through the filters without difficulty. Scientists concluded that the infectious federal agent must be smaller than a typical bacterial cell. After upgrade investigation, the scientists found that the agent could reproduce only(prenominal) inside the surviving cells it infected. They called the agent a virus, a Latin word sum poison. The true nature of viruses was discovered in 1933 when the biolog ist Wendell Stanley of the Rockefeller lend tried to purify an extract of the tobacco mosaic virus (tobacco mosaic virus). To his great surprise, the purified tobacco mosaic virus extract form crystals, a quality of chemicals. Stanley concluded that tobacco mosaic virus is chemical return rather than a living organism. Within a fewer years of Stanleys findings, scientists were open to break TMV and confirm his conclusion. TMV is a chemical, not a cell. Each particle of TMV is made of only cardinal kinds of molecules: the nucleic acid RNA and protein. TMV consists of a core of RNA surround by a coat of protein. Later scientists were able to secern the RNA from the protein. When they reassembled the twain components, the reconstructed TMV particles were adepty able to infect healthy tobacco plants.

The chemicals were the virus itself, not merely derivatives of it. Through this experiment and others, a general picture of virus structure and function has emerged. A virus is... Anybody who rates these notes negatively is off their rocker. This isnt supposed to be an essay people, this is a toughened of notes, and they argon quite careful and informative which means that they are valuable research and theater of operations tools. I do weigh that is what cheathouse was created for. To assist students with research and canvass and these notes are quite beneficial. Dont be disheartened ccmustangs2001, good job. If you compulsion to get a full essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay