Why are diseases caused by viruses often very difficult to treat?
a. They are difficult to identify.
b. They are obligate intracellular parasites.
c. They cannot be seen under the microscope.
d. They cannot be destroyed by antibiotics.
d
FEEDBACK: a. Incorrect. Over 500 viruses have been identified.
b. Incorrect. This refers to the fact that viruses only live inside another organism, but not the primary reasons why they are difficult to treat.
c. Incorrect. It is true that they cannot be seen under a traditional light microscope, but they can be seen under an electron microscope, so this does not contribute to the difficulty in treatment.
d. Correct. Viruses are often difficult to treat as they cannot be destroyed by antibiotics.
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