BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Each virus infects a specific tissue & each virus infects differently
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Viruses do not differentiate the type of tissue they infect.
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All viruses infect the same way.
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Viruses insert proteins into the target cells.
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Detailed explanation-1: -Once a virus gets into a host’s body, it travels along the surfaces of cells until its proteins begin to bind with receptors on the cells. The virus and the cells then fuse, allowing the DNA or RNA inside the virus to enter the cells, where it begins to reproduce.
Detailed explanation-2: -Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system’s antibodies and other cells to target the invader.
Detailed explanation-3: -A virus attaches to a specific receptor site on the host cell membrane through attachment proteins in the capsid or via glycoproteins embedded in the viral envelope. The specificity of this interaction determines the host-and the cells within the host-that can be infected by a particular virus.
Detailed explanation-4: -Viral diseases are mainly caused when a virus enters the human body and uses the host machinery to reproduce. If the body’s immune system fails to fight against viruses, it multiplies and spreads to other cells causing infections.
Detailed explanation-5: -Viruses can infect only certain species of hosts and only certain cells within that host. The molecular basis for this specificity is that a particular surface molecule, known as the viral receptor, must be found on the host cell surface for the virus to attach.