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Questions and Answers
Why are viruses considered obligate intracellular parasites?
Why are viruses considered obligate intracellular parasites?
- They are susceptible to antibiotics
- They have their own ATP generating system
- They lack a receptor-binding site
- They multiply only in living cells (correct)
What is the unique feature of Pox virus regarding its genome as observed by electron microscopy?
What is the unique feature of Pox virus regarding its genome as observed by electron microscopy?
- It has a peculiar replication cycle
- It is the only virus with a genome observed by EM (correct)
- It lacks a genome
- It has a larger genome compared to other viruses
What is the general size range of viruses?
What is the general size range of viruses?
- 100 - 500 nm
- 1 - 10 µm
- 20 - 300 nm (correct)
- 500 - 1000 nm
What is the function of the receptor-binding site on viruses?
What is the function of the receptor-binding site on viruses?
Where is the envelope located in viruses?
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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