Biology notes on viruses.

Notes pg. 455-461 Biologists first suspected the existence of computer computer viruses dear(p) the end of the ordinal century. At that time, European scientists were seeking to expose the infectious component responsible for baccy 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 with them. However, the infectious instrument passed through the filters without difficulty. Scientists concluded that the infectious performer must be smaller than a typical bacterial cell. After upgrade investigation, the scientists found that the agent could reproduce precisely 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 biologist 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 organize crystals, a quality of chemicals. Stanley concluded that tobacco mosaic virus is chemical involvement rather than a living organism. Within a a few(prenominal) 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 deuce 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 native and informative which means that they are valuable research and assume tools. I do weigh that is what cheathouse was created for. To assist students with research and study and these notes are quite beneficial. Dont be disheartened ccmustangs2001, good job. If you fate to get a full essay, order it on our website: OrderEssay.net

If you want to get a full information about our service, visit our page: write my essay