Biology 1002B Lecture Notes - Lecture 5: Galactose, Mutation Rate, Retrovirus
24 Oct 2016
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Document Summary
Viruses and retroviruses: 1/3 of world killed, killed 20-50 m. 3. 5% world population: one of the deadliest natural disasters in human history. Small infectious agents which replicate inside the living cells of other organisms. Simply one or more nucleic acid molecules surrounded by a protein coat- repeating protein subunits: virus genome is small. Coat may be surrounded by membrane from host cell. Does not have cytoplasm enclosed by a plasma membrane. Helical virus- protein subunits assemble in a rodlike spiral around the genome. Polyhedral- coat proteins form triangular units that fit together like the parts of a soccer ball. Include forms that infect animals, plants and bacteria. Acquired as the virus enters the host cell. Although it may have a membrane- not a cell. Membrane contains host and viral proteins: aids entry into cells, can adapt by altering membrane proteins. More than 4000 species of viruses have been classified into more than.
