Biology 1001A Chapter Notes - Chapter 23.1: Wart, Cell Nucleus, Hepa

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9 Nov 2016
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23.1 What is a Virus?
Viruses lack many properties of life shared by other organisms so they are infectious
biological particles
o Cannot reproduce on their own and lack a metabolic system => rely on a host
o Viruses do not have a cytoplasm enclosed by a plasma membrane
A virus is one or more nucleic acid molecules surrounded by a protein coat or a capsid
The enveloped virus’ membrane or envelope is often derived from the host cell’s
membrane
The nucleic acid genome of a virus can be composed of a single or double strand of DNA
or RNA
All viruses have genes that encode at least their coat proteins and proteins that regulate
transcription
Helical Virus Polyhedral Virus
Enveloped Virus Complex Polyhedral Virus
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