Flashcards in Ch 9 - Virology Deck (29)
1
genetic element that cannot replicate independently of a living (host) cell
Virus
2
extracellular form of a virus
virion
3
are most viral genomes circular or linear?
mostly linear
4
the protein shell that surrounds the genome of a virus particle
capsid
5
subunit of the capsid
capsomere
6
complete complex of nucleic acid and protein packaged in the virion
nucleocapsid
7
virus that contains additional layers around the nucleocapsid
enveloped virus
8
viruses lyse host cells after infection
virulent mode
9
viruses replicate their genomes in tandem with host genome and without killing host
temperate mode
10
state where most virus genes are not expressed and virus genome (prophage) is replicated in synchrony with host chromosome
lysogeny
11
a bacterium containing a prophage
lysogen
12
release of virions from host cell does not result in cell lysis
persistent infections
13
delay between infection by the virus and lytic events
latent infections
14
conversion of normal cell into tumor cell
transformation
15
two or more cells become one cell with many nuclei
cell fusion
16
give an example of a retrovirus (ssRNA)
HIV
17
give an example of a hepadnavirus (dsDNA)
hepatitis B
18
Attachment of the virus to a susceptible host cell
adsorption
19
Entry of the virion or its nucleic acid
penetration
20
what are the phases of viral replication?
1) attachment
2) entry
3) synthesis of nucleic acids & proteins
4) assembly of capsids
5) release (lysis)
21
two phases of the latent period
eclipse and maturation
22
number of virions released
burst size
23
proteins necessary for replication of virus nucleic acid
early proteins
24
proteins that make up the structural components
late proteins
25
these viruses can undergo a stable genetic relationship within the host
temperate
26
viruses that are parasitic on other viruses
defective viruses
27
infectious RNA molecules that lack a protein coat
viroids
28
infectious proteins whose extracellular form contains no nucleic acid
prions
29