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 because reverse transcriptase lacks proofreading
d. The only way to kill a virus is with a vaccine, not with drugs
e. People with HIV infections die very rapidly, before the drugs have a chance to cure them
c. HIV mutates rapidly because reverse transcriptase lacks proofreading
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Who is credited with demonstrating unidirectional and nonreciprocal transfer of DNA between two mating E. coli cells?
A. Tatum B. Hayes C. Lederberg D. None of the choices are correct.
A positive pyrrolidonyl arylamidase (PYR) test was observed on a species of Enterococcus. What color should be observed for this reaction?
a. Purple b. Red c. Green d. Pink
Which of the following plant groups contains the gene LFY?
a. Only mosses, which arose 400 million years ago. d. Only plants with flowers because expression of the gene gives rise to flowers. b. Only plants with leaves because expression of the gene gives rise to leaves. e. All land plants. c. Only plants with apical meristems because expression of the gene regulates meristematic tissue.
When monocots, such as rice and oats, are cultivated and milled by humans, what part of the seed remains for
consumption?
a. endosperm b. bran c. seed coat d. embryo e. cotyledon