SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They harm the cells they enter.
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They multiply.
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They use their own energy to develop.
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They make their own food.
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Detailed explanation-1: -Obligate pathogens require a host to fulfil their life cycle. All viruses are obligate pathogens as they are dependent on the cellular machinery of their host for their reproduction.
Detailed explanation-2: -The first stages of an infection happen when a virus gets past our physical barriers of skin and mucus, and enters a suitable cell. Once inside, a virus can take over the cell, forcing the cell to make many copies of the virus (replicate), which damages the cell and sometimes kills it.
Detailed explanation-3: -Pathogens cause illness to their hosts through a variety of ways. The most obvious means is through direct damage of tissues or cells during replication, generally through the production of toxins, which allows the pathogen to reach new tissues or exit the cells inside which it replicated.
Detailed explanation-4: -Viruses Bind to Molecules Displayed on the Host Cell Surface The first step for any intracellular pathogen is to bind to the surface of the host target cell. For viruses, binding is accomplished through the association of a viral surface protein with a specific receptor on the host cell surface.