All of the following are reverse transcriptase inhibitors used to treat HIV infection EXCEPT ________.
A. azidothymidine
B. lamivudine
C. zalcitabine
D. didanosine
E. acyclovir
Answer: E
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When chromosomes have either duplications or deletions, the chances that the mutation will be harmful are a function of:
A. its sizeâ€"the smaller the duplication or deletion, the greater the chance of harm. B. its sizeâ€"the larger the duplication or deletion, the greater the chance of harm. C. its locationâ€"if it occurs in a germ-line cell, it will be more harmful than if it occurs in a somatic cell. D. its position on the chromosomeâ€"if it occurs at the tip of a long arm, it is likely to be less harmful than if it occurs at the tip of a short arm. E. None of the answer options are correct.
Which of the following is the least successful
method of birth control? a. early withdrawal b. a condom alone c. a spermicidal jelly or foam alone d. douching e. the Pill
The effectiveness of geographic barriers in
promoting speciation is related most to a. the size of the barrier. b. the inability of the organisms to overcome the barrier. c. the speed at which the barrier forms. d. how long the barrier exists. e. the size of the population it separates.
Which of the following is true about the “synthetic” bacterium made in 2010?
a. A chromosome was synthesized from a known sequence and transformed into a cell from a different species. b. A chromosome was assembled from biobricks and transformed into a different species. c. Biobricks were assembled into a completely synthetic organism. d. A chromosome was synthesized from a known sequence and was transformed into an artificially created cell.