All of the following are reverse transcriptase inhibitors used to treat HIV infection EXCEPT
A. didanosine.
B. azidothymidine.
C. lamivudine.
D. acyclovir.
E. zalcitabine.
Answer: D
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The value of inserting human genes suspected of
causing Alzheimer disease into mice is to a. make mice act more human. b. make antibodies, which can be injected into suffering patients. c. develop mice that can serve as models for study of this condition. d. use the mice for production of a vaccine for the disease. e. accomplish all of these.
Springwood has narrower conducting cells and many fibers. Indicate whether the statement is true or false
The loss of ventral spines by modern freshwater sticklebacks is due to natural selection operating on the phenotypic effects of Pitx1 gene _____
A) duplication (gain in number) B) elimination (loss) C) mutation (change) D) silencing (loss of expression)
Nonpolar hormones can pass through the intestinal cell membrane without being digested, and therefore can be taken orally. What hormones might therefore be available as pills?
A. Thyroid hormones and steroid hormones B. Insulin and growth hormone C. Calcitonin and glucagon D. Melatonin and prolactin E. Oxytocin and antidiuretic hormone