It has been difficult to generate drugs to treat AIDS for which reason?
A. HIV does not cause AIDS. B. HIV does not use any enzymes that can be targeted by drugs.
C. HIV mutates rapidly.
D. The only way to kill a virus is with a vaccine, not with drugs.
E. People with HIV infections die rapidly, before the drugs have a chance to cure them.
C. HIV mutates rapidly.
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Which of the following is a possible reason why DNA uses thymine instead of uracil?
A. Thymine is more stable than uracil. B. Cytidine is deaminated to uracil so it would be difficult for any repair mechanism to differentiate between uracil that belongs in the sequence and uracil that resulted from deamination. C. Adenine is deaminated to uracil so it would be difficult for any repair mechanism to differentiate between uracil that belongs in the sequence and uracil that resulted from deamination. D. When uracil is bound to a deoxyribose it will become more reactive, forming covalent bonds with other bases. E. None of these choicesis correct.
Boyle's law of gas behavior predicts that as the volume of the lungs _____, the pressure of gases within the lungs must ______.
A. increase, decrease B. increase, increase C. decrease, decrease D. increase, not change E. decrease, not change
Jaws and paired fins evolved in early __________. Fill in the blank(s) with the appropriate word(s)
The cells of the nervous system that transmit nervous system messages are the:
A) neurons. B) synapses. C) glial cells. D) dendrites.