components of a virus
capsids, nucleic acids, and envelopes
Helical and Icosahedral
virus without envelope
non-cellular parasitic protein coated genetic elements that can infect all living things, including microgranisms
to multiply viruses depond on
the infected cells machinery to multiply and disperse
fully form virus that is able to cause an infection in the host
study of viruses
an obligate intracellular parasite
can see viruses only with
the capsid is composed of protein subunits called
protein shell around the nucleic acid core of a virus
does not have an envelope; released from the infected host cell through cell lysis
Nucleic acid and capsid together
function of capsid
simulate antibodies production for future infectins, protects the viral nucleic acid, facilitates attachment of virus, helps introduce the virus to suitable host cell
The central core of a virus particle consists
nucleic acid; RNA or DNA: (not both)
usually double stranded, may be single stranded; circular or linear (replicated and assembled in nucleus).
usually single stranded, may be double stranded; positive and negative-sense RNA. (replicated and assembled in cytoplasm)
a RNA Virus can cause
cancer and tumers
an enzyme that converts a single strand of RNA to a double stranded DNA
negative RNA virus must first
synthesize a DNA copy
positive sense RNA
single stranded genomes that are ready for immediate translation. (protein synthesis)
negative sense RNA
single stranded genomes that must be converted into proper form - not ready for translation.
in mulitpilication viruses aquire envelopes during
sequence of events in viral multiplication
adsorption, penetration, uncoating, synthesis, assembly and release
DNA viruses multiply in the host cells
RNA viruses multiply in the host cells
effects due to infection of a virus, cells can undergo gross shape/size changes and/or develop intracellular changes
a virus that infects bacteria
a virus that can cause cancer
T-even phages infect ______ bacteria
(lysogenic replication cycle) Process of viral replication in which a bacteriophage enters a bacterial cell, inserts into the DNA of the host, and remains inactive. The phage is then replicated every time the host cell replicates its chromosome. Later, the phage may leave the chromosome.
geometric figure having 20 surfaces that meet to form 12 corners
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