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Questions and Answers
What is a virus?
What is a virus?
- A nucleoprotein that multiplies only in non-living cells
- A nucleoprotein that multiplies only in living cells (correct)
- A microorganism visible with a light microscope
- A type of fungi causing diseases in plants
What is the size of a virus?
What is the size of a virus?
- Large enough to be seen with a light microscope
- Too small to be seen individually with a light microscope (correct)
- Slightly smaller than a bacteria cell
- Visible to the naked eye
How many viruses are known to date?
How many viruses are known to date?
- Around 1,000
- Exactly 3,000
- Less than 500
- More than 2,000 (correct)
What do viruses parasitize?
What do viruses parasitize?
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What are viruses composed of?
What are viruses composed of?
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What is the nature of viruses?
What is the nature of viruses?
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Which of the following diseases can be caused by viruses?
Which of the following diseases can be caused by viruses?
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How many different species of plants can one virus infect?
How many different species of plants can one virus infect?
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In addition to plants, what other living organisms can viruses attack?
In addition to plants, what other living organisms can viruses attack?
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What is the primary function of the protein in viruses?
What is the primary function of the protein in viruses?
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Study Notes
What is a Virus?
- A virus is an infectious agent that replicates inside the cells of an organism.
Characteristics of Viruses
- The size of a virus varies between 20-400 nanometers (nm) in diameter.
- To date, over 2,000 species of viruses are known.
Host Range of Viruses
- Viruses parasitize a wide range of organisms, including animals, plants, fungi, and bacteria.
Composition of Viruses
- Viruses are composed of genetic material (either DNA or RNA) surrounded by a protein coat called a capsid.
Nature of Viruses
- Viruses are not considered living organisms, as they cannot reproduce on their own and require a host cell to replicate.
Diseases Caused by Viruses
- Viruses can cause a variety of diseases, including influenza, HIV, Ebola, measles, and COVID-19.
Host Range of Plant Viruses
- A single virus can infect multiple species of plants, with some viruses able to infect hundreds of different plant species.
Range of Host Organisms
- In addition to plants, viruses can also attack animals, bacteria, and fungi.
Function of Protein in Viruses
- The primary function of the protein in viruses is to protect the viral genome and facilitate its transmission to a host cell.
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