Retroviruses are medically important viruses because

A) they include the viruses the cause hepatitis.
B) some retroviruses cause cancer.
C) they include the virus that causes AIDS.
D) they include viruses that cause cancer and AIDS.


Answer: D

Biology & Microbiology

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A scientific theory is:

A. a suggested explanation that accounts for observations. B. a way to organize how we think about a problem. C. a concept that is supported by experimental evidence that explains the facts in an area of study. D. a way to understand a complex system by reducing it to its working parts.

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Antibiotics

A. cause mutations to occur. B. may act as alkylating mutagens. C. provide an environment in which preexisting mutants survive. D. increase the rate of spontaneous mutation.

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________ tend to be more toxic than ________

a. Aromatic compounds; chlorofluorocarbons b. Aliphatic compounds; aromatic compounds c. Aliphatic compounds; refined petroleum products d. Aromatic compounds; aliphatic compounds

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Somatic sensations include all EXCEPT which one

of the following? a. heat and cold b. pressure and touch c. pain d. position of the body’s limbs e. sound

Biology & Microbiology