Questions and Answers
Which of the following is true about viruses?
Viruses cause most diseases in the industrialized world
Which of the following is true about virions?
Virions are made up of RNA and protein
Which of the following is true about viroids?
Viroids are made up of circular fragments of RNA
Which of the following is true about viruses and viroids?
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Which of the following is true about the structure of viruses?
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Study Notes
Viruses
- Viruses are infectious agents that replicate inside the cells of an organism
- They are composed of genetic material (DNA or RNA) surrounded by a protein coat
- Viruses can infect all types of life forms, including animals, plants, and bacteria
Virions
- A virion is a complete, infectious virus particle
- It consists of the viral genome and the protein coat that surrounds it
- Virions are capable of surviving outside of a host cell for a period of time
Viroids
- Viroids are small, single-stranded RNA molecules that infect plants
- They are the smallest known infectious agents, consisting of only a few hundred nucleotides
- Viroids do not have a protein coat and are not considered to be living organisms
Viruses and Viroids
- Both viruses and viroids are infectious agents that replicate inside host cells
- They are both composed of genetic material, but viruses have a protein coat while viroids do not
- Both can cause disease in infected organisms
Structure of Viruses
- The structure of a virus consists of the viral genome and the protein coat
- The protein coat is made up of repeating units of protein called capsomeres
- The shape of a virus can be helical, spherical, or complex, and is determined by the arrangement of the capsomeres
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