Questions and Answers
Why are viruses considered obligate intracellular parasites?
They multiply only in living cells
What is the unique feature of Pox virus regarding its genome as observed by electron microscopy?
It is the only virus with a genome observed by EM
What is the general size range of viruses?
20 - 300 nm
What is the function of the receptor-binding site on viruses?
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Where is the envelope located in viruses?
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Study Notes
Viral Characteristics
- Viruses are considered obligate intracellular parasites because they require a host cell to replicate and survive.
Pox Virus Genome
- The unique feature of Pox virus regarding its genome is that it is brick-shaped and has a linear double-stranded DNA molecule.
Size Range of Viruses
- The general size range of viruses is between 20-400 nanometers (nm) in diameter.
Receptor-Binding Site
- The receptor-binding site on viruses is responsible for recognizing and binding to specific receptors on host cells, allowing the virus to enter the cell.
Viral Envelope
- The envelope is a lipid bilayer membrane located on the outside of some viruses, which helps to protect the viral genome during transmission and aids in the attachment and entry of the virus into host cells.
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