Virusis and virology

6 important questions on Virusis and virology

What is a virion?

It is a virus particle. The extracellular form of a virus, this is the way it can transfer from one host to another host. It contains a nucleic acid genome surrounded by a protein coat.

3 enzymes inside of a virion and function?

- Lysozyme: makes hole in cell wall
- Nucleic acid polymerase: makes viral genome
- Neuraminidases: allows liberation of virus from host.

Eukaryotic and Prokaryotic viral infection destruction mechanisms?

EUK: Immune defense mechanism and RNA interference.
PROK: CRISPR and restricition modification system.
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2 viral life cycles?

- Virulent mode: virus lyses host cell after infection
- Temperate mode: virus replicates genome with host genome without killing host.

What is a lysogen?

Its a bacteria that contains a prophage (viral genome). Host is not killed after replication

What is a retrovirus? What are its specific genes? and their functions

A retrovirus is a RNA virus that replicates through DNA intermediate.
It consists of 3 special genes:
GAG: encodes structural genes
POL: encodes reverse transcriptase and integrase
ENV: encodes envelope proteins

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