BIOL 1107 Chapter Notes - Chapter 19: Martinus Beijerinck, Adolf Mayer, Viral Envelope
Document Summary
Hiv virus injects genetic material in cell and produces more. Viruses are smaller than eukaryotic and prokaryotic cells. Virus: infectious particle with genes packaged in protein coat. Can"t carry out metabolism outside of host cell. Consists of nucleic acid surrounded by protein coat. Adolf mayer: discovered how to transmit disease from plant to plant by rubbing it on healthy plants. Suggested disease was too tiny/invisible in microscope. Ivanowsky: passed disease through filter but still produced mosaic disease afterwards. Martinus beijerinck: showed infectious agent in filtered sap could replicate. Experiment: extracted sap from tobacco plant with disease filtered sap rubbed filter sap on healthy plant healthy plant got the disease. Conclusion: infectious agent was not bacteria it was replicated within host it infected. Tiny viruses 20 nm in diameter smaller than ribosome. Virus is an infectious particle with nucleic acid enclosed in protein coat with envelope sometimes. Viruses genomes consist of double dna, single dna, double rna or single rna.
