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Viruses

Terms in this set (68)

Devolution
proposes to explains the origin of viruses by suggesting that viruses evolved from free-living cells.
Escapist
accounts for viruses having either an RNA or a DNA genome and suggests that viruses originated from RNA and DNA molecules that escaped from a host cell.
Self-replicating
evolving alongside the cells they rely on as hosts.
Acellular
viruses are biological entities that do not have a cellular structure. (lacking component of cells such as organelles, ribosomes, and the plasma membrane)
Envelope
outer layer made of protein and phospholipid membranes derived from the host cell.
Capsid
nucleic acid genome covered by a protective layer of proteins.
Capsomers
protein subunits that the capsid is made of
general shapes of viruses
filamentous, isometric (icosahedral), enveloped, and head and tail
Filamentous viruses
long and cylindrical (TMV)
Isometric Viruses
roughly spherical, such as poliovirus or herpesvirus.
Enveloped virus
viruses with membranes with surrounding capsids. such as animal viruses (HIV)
Head and Tail virus
infect bacteria and have a head that is similar to the icosahedral virus and a tail shape like filamentous viruses
Viral Receptors
viruses use some sort of glycoprotein to attach to their host cell via receptors that are found on cell surfaces and have their own physiological functions.
viral core
contains the genome or total genetic content of the virus
viral genomes
genes that encode proteins that the virus cannot get from the host cell.
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