OVERVIEW OF THE IMMUNE SYSTEM
IMMUNITY INNATE AND ADAPTIVE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A virus becomes living when in contact with a host organism.
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A virus infects a host organism by injecting its DNA into the cells of the host organism.
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A virus infects a host organism by pulling the DNA from the cells of the host organism into itself.
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A virus becomes living when a sufficient number of viruses invade a host organism and cause an infection.
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Detailed explanation-1: -Q. Which best explains how a nonliving virus is able to reproduce? A virus becomes living when in contact with a host organism.
Detailed explanation-2: -A virus infects a host organism by pulling the DNA from the cells of the host organism into itself.
Detailed explanation-3: -A virus is an infectious particle that reproduces by “commandeering” a host cell and using its machinery to make more viruses. A virus is made up of a DNA or RNA genome inside a protein shell called a capsid.
Detailed explanation-4: -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-5: -Nonliving characteristics include the fact that they are not cells, have no cytoplasm or cellular organelles, and carry out no metabolism on their own and therefore must replicate using the host cell’s metabolic machinery. Viruses can infect animals, plants, and even other microorganisms.