10 Questions
What is a virus?
A nucleoprotein that multiplies only in living cells
What is the size of a virus?
Too small to be seen individually with a light microscope
How many viruses are known to date?
More than 2,000
What do viruses parasitize?
Living cells of various organisms
What are viruses composed of?
Nucleic acid and protein
What is the nature of viruses?
Chemical molecules
Which of the following diseases can be caused by viruses?
Influenza
How many different species of plants can one virus infect?
Dozens
In addition to plants, what other living organisms can viruses attack?
Humans and animals
What is the primary function of the protein in viruses?
Forming a protective coat around the nucleic acid
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.
Test your knowledge of plant pathology with this quiz on the fundamentals of viruses, their nature, architecture, multiplication, and transmission. Learn about the characteristics of viruses and their impact on plant health.
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