Question

What is the difference between an enveloped vs. non-enveloped virus? Give one example of each. In an enveloped virus, where does the envelope come from?

Answer 1

	Enveloped virus	Non-enveloped virus
Definition	virus that have a lipid membrane outside the protein capsid.	no lipid membrane present outside of protein capsid.
Components	Nucleocapsid + Envelope	Nucleocapsid only
Lipid bilayer with protein	Have a lipid bilayer with protein.	No lipid bilayer with protein.
Virulence	Less	More
Host Lysis	very rare often release by budding.	Often cause host lysis.
Heat , Dryness & Acid	Sensetive	Resistant
Survival in gastrointestinal tract	cannot survive	can survive
Example	HIV , HSV ,HBV Adenovirus and Influenza virus.	Norovirus and parvovirus.

2.

• Double Stranded DNA Genomes :-Herpesviridae

• Single Stranded DNA Genomes:-Circoviridae

• Double Stranded RNA Genomes:- Amalgaviridae.

• Positive Strand RNA Genomes:-Flavivirus, Alphavirus

• Negative Strand RNA Genomes:- Orthomyxoviridae

• Retroviruses :-Caulimoviridae