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Viruses cannot move or reproduce without the help of a host cell. When a virus finds a host, it can increase and spread quickly.
To find a host, viruses have receptors on their surfaces that match up with their ideal target cell. It then takes over the cellular machinery inside the host's cell to reproduce by multiplying the virus's genetic material and proteins.
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Viruses are not alive by most definitions. They are generally smaller than most bacteria, about a tenth of the size of a human blood cell.
The structure of a virus is very simple: Each one consists of either DNA or RNA, enclosed in a protein pocket called a capsid. Viruses can't gener...
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In 1938, Helmut Ruska, a German physician and biologist, saw the potential of the electron microscope in the application to the field of biology. Helmut collected images, including the variola virus (which causes smallpox) and presented images of the virus particles at a meeting of the Medical So...
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They are a group of viruses that cause respiratory infections, including the common cold.
They can infect certain animals and spread from one animal to another. They can reach the human body if certain mutations occur in the virus.
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The immune system does an outstanding job most of the time. To provide such excellent protection against bacteria, viruses, parasites, and fungi, our immune system must continuously learn.
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