LIFE 102 Lecture Notes - Lecture 43: Rna Virus, Intracellular Parasite, Wendell Meredith Stanley
Document Summary
*tobacco mosaic disease stunts growth of tobacco plants and gives their leaves a mosaic coloration. *in the late 1800s, researchers hypothesized that a particle smaller than bacteria caused the disease. *in 1935, wendell stanley confirmed this hypotheses by crystallizing the infectious particle, now known as tobacco mosaic virus (tmv) *nucleic acid (dna or rna) in a protein coat and sometimes a membranous envelope. *depending on its type of nucleic acid, a virus is called a dna virus or an rna virus. The protein shell that encloses the viral genome. *some viruses have membranous envelopes that help them infect hosts. Surround the capsids of influenza viruses and many other viruses found in animals. Contain a combination of viral and host cell molecules. Have the most complex capsids found among viruses. Have an elongated capsid head that encloses their dna. A protein tail piece attaches the phage to the host and injects the phage dna inside.
