
Concept explainers
To fill:
The name of the agent that causes infectious disease.
Introduction:
A virus is a microscopic organism that replicates only inside the living cells of an organism. It infects all type of life forms from plants, animals, microorganisms including bacteria and archaea.

Answer to Problem 1A
A virus is an agent that causes infectious disease.
Explanation of Solution
A virus is surrounded by a protein coat that is a collection of genetic code either DNA or RNA. It cannot replicate alone. Interestingly, viruses can only survive inside a living cell. Viruses are microscopic organisms that cannot be seen with naked eyes. Viruses have been found everywhere on earth.
A virus is a microorganism that cannot be seen with our naked eyes. It can only be seen with microscope. It cannot replicate alone. Viruses have been found everywhere on earth.
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