Chap. 19 Viruses Flashcards
Three characteristics of viruses
Acellular
Non living
Obligate intro cellular parasites
Acellular
Not a cell
Main ways to classify viruses
Size
Type of gnome
Morphology (shape)
Total structure of viruses
Nucleocapsid
Two types of molecules that make up a virus
Protein
Nucleic acid
Protein shell of a virus is called
Capsid
The Nucleic acid within a virus can be either
Double or single stranded RNA
Double or single stranded DNA
Subunits of capsizes are
Capsomeres
20 equallatural triangal faces
Icosahedron
Helical capsizes look like
Rods
“Complex” virus structures look like
Lunar landers
Bilipid membranous structures taken with the virus after leaving the cell
Envelope
Retroviruses contain what enzyme
Reverse transcriptase
Proteses are
Enzymes that chop nucleotides
Virus matrix
Protein layer between nucleopasid and envelope
Reversetranscriptase replicates
RNA into DNA
Viruses subunits come together to form new viruses at
Self assembly
Viruses exit the cell by
Exocytosis
Lysis ( breaking open of the cell)
Budding from host
What is reassortment
When multiple viruses enter one cell then during self assembly the subunits of the two viruses come together to make a new virus
Circular RNA molecules that infect plants cells
Viroids
Preons
Slow acting, virtually industry able infectious proteins that cause brain diseases in mammals
Preons work by
Changing existing proteins within the body to act as the preons that can not be broken down
Pages
Bacteria infecting viruses
Lyric cycle
Viral cycle ending with the cell explode
