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Questions and Answers
What is the primary reason viruses are not classified as living organisms?
What is the primary reason viruses are not classified as living organisms?
- They do not have cellular structure. (correct)
- They do not contain genetic material.
- They can reproduce outside a host cell.
- They lack the ability to respire.
Which statement accurately describes the composition of viruses that infect animal cells?
Which statement accurately describes the composition of viruses that infect animal cells?
- They contain either DNA or RNA, but never both. (correct)
- They only contain DNA.
- They contain both DNA and RNA.
- They only contain RNA.
What defines a bacteriophage?
What defines a bacteriophage?
- A virus that can reproduce without a host.
- A virus that specifically infects bacterial cells. (correct)
- A virus with a protein coat made entirely of RNA.
- A virus that infects animal cells.
Which part of a virus is responsible for its protection?
Which part of a virus is responsible for its protection?
Why are most viruses not visible under a light microscope?
Why are most viruses not visible under a light microscope?
Flashcards
Virus
Virus
A non-living infectious particle that can only reproduce inside a living cell.
Virus Size
Virus Size
Viruses are too small to be seen with a light microscope and require an electron microscope to be visualized.
Capsid
Capsid
The outer protein coat of a virus that protects the nucleic acid core.
Obligate Endoparasite
Obligate Endoparasite
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Host Specificity
Host Specificity
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Study Notes
Viruses
- Viruses are unique, displaying characteristics of both living and non-living things
- Cannot be placed in any of the five kingdoms
- Viruses are considered infectious particles
- Virology is the study of viruses
- Viruses cannot breathe, eat, respire, or respond to stimuli
- Viruses only reproduce inside a living cell
- Viruses are obligate endoparasites
- Viruses are host-specific, attacking only certain types of tissue
- Viruses are very small (20-300 nm)
- Viruses are only visible with an electron microscope
- Viruses have a protein coat (capsid) enclosing a nucleic acid core (DNA or RNA)
- Plant viruses have RNA
- Animal viruses have either DNA or RNA, but never both
- Bacteriophages (viruses that infect bacteria) have a DNA core
- Most viruses are symmetrical
- Some viruses are spherical
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