Microbiology Test 3

Lytic CycleAttachment penetration biosynthesis maturation ReleaseLysogenic cycleAttachment, penetration, Phage DNA integrates within the chromosome by recombination becoming a prophage, Cell reproduces normally, (biofusion may occur), prophage may be excised by recombination event to go to lytic cycle

Obligate intracellular particle that requires a host cell to replicate

Nucleic acid-genomeProtein coat

Completely assembled virus outside the host

Part of the protein coate that gives a virus its shape and symmetry

Special capsid protein that helps in attachment to the host cell (determines the host range)

Viruse composed soley of the nucleocapsid (no envelope)

Tightly wound coil (cork screw/spring)

20-sided triangular faces and 12 corners

Combination of helical and icosahedral (small pox)

1Regressive evolution-viruses are degenerated life-forms; derived from intracellular parasites that lost many functions and only retain genes necessary for the parasitic lifestyle2 Cellular origin- viruses are derived from fragments of cellular genetic material and functional assemblies macromolecules3 Independent entities- viruses coevolved with cellular organisms from the self-replicating molecules that were believed to have existed in the primitive pre-biotic earth

Tiny fragments of nucleic acid known to cause disease in crop plants1/15 the size of a virusRNA that interfers with proper protein production

Transmissible spongiform encephalopathies

Are proteinacious material that cause disease

Weight loss, unsteadiness, aggressiveness, and lacking coordination, which eventually leads to death