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VirusOnline version

First part

by David Gonzalez
1

microscopic living collection envelope host RNA smallest single small acid lipids DNA fatty

Virus , an infectious agent of size and simple composition which can multiply only in cells of animals , plants or bacteria .
Viruses are ; they range in size from about 20 t0 250 nanometers in diameter . By contrast the bacteria are about 400 nanometers in size . A virus consists of a - or double stranded nucleic core surrounded by a protein capsid ; some viruses also have an outer composed of materials ( ) and proteins . The nucleic acid core carries the virus's genome ? its of genes ? and may consist of either deoxyribonucleic acid ( ) or ribonucleic acid ( ) . The protein capsid provides protection for the nucleic acid and may contain molecules that enable the virus to enter its appropriate cell .

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