Micro Lec Exam 2 Study Guide Chap 6

33 terms by txibarra

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components of a virus

capsids, nucleic acids, and envelopes

virus shape

Helical and Icosahedral

virus without envelope

naked virus

virus

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

virion

fully form virus that is able to cause an infection in the host

virology

study of viruses

an obligate intracellular parasite

virus

can see viruses only with

electron microscope

the capsid is composed of protein subunits called

capsomers

protein shell around the nucleic acid core of a virus

capsid

naked virus

does not have an envelope; released from the infected host cell through cell lysis

nucleocapsid

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

capsid shape

helical,icosahedral,complex

The central core of a virus particle consists

nucleic acid; RNA or DNA: (not both)

DNA virus

usually double stranded, may be single stranded; circular or linear (replicated and assembled in nucleus).

RNA virus

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

reverse transcriptase

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

assembly

sequence of events in viral multiplication

adsorption, penetration, uncoating, synthesis, assembly and release

DNA viruses multiply in the host cells

nucleus

RNA viruses multiply in the host cells

cytoplasm

ctyopathic effects

effects due to infection of a virus, cells can undergo gross shape/size changes and/or develop intracellular changes

bacteriophage

a virus that infects bacteria

oncogenic virus

a virus that can cause cancer

T-even phages infect ______ bacteria

e-coli

lysogeny

(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.

icosahedral

geometric figure having 20 surfaces that meet to form 12 corners

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