Micro Biology > EXAM REVIEW > Microbiology Exam Guide 2 Viruses and Virology (All)
Microbiology Exam Guide 2 Viruses and Virology Viruses o Virus-small infection agent, replicates only in living cells (hosts) Can only infect specific hosts Highly specific Can i... nfect all types of cells Some can infect other viruses o Virion-virus particle that is an extracellular form Outside the cell Has nucleic acid genome, surrounded by protein coat Might have an extra lipid layer, has lots of receptors on the outside Able to infect Morphology of Virion o Smaller than bacteria o Only have nucleic acids with a protein coat/capsid o Icosahedral viruses-spherical 20-300 nm Symmetry Form a closed shell Might have sharp visible edges Can be enveloped viruses-have a membrane that surrounds the nucleocapsid Lipid bilayer with embedded proteins or lipid monolayer Envelope makes initial contact with the host cell o Helical viruses-tube/rod like Capsid proteins on outside with RNA in cylindrical shape Length depends on the length of the nucleic acid Width is determined by size of packaging or protein subunits (capsomeres) o Complex viruses-bacteriophages Have a head, tail, and collar (connects head and tail) DNA only in the head, rest is protein Tail helps inject DNA into other cells o Capsid-protein shell that surrounds the genome of a virus Made of protein molecules arranged in a highly repetitive pattern around the nucleic acid Capsomere-subunit of capsid Smallest morphological unit, can see with electron microscope Nucleocapsid-complex of nucleic acid and protein packed into the virion [Show More]
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