The sexually transmitted disease characterized by painful genital ulcers is
A. chancroid.
B. syphilis.
C. gonorrhea.
D. trachoma.
A
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Four of the following are true about water molds. Which one is the exception?
a. Water mold is responsible for the Irish potato famine. b. Some species are aquatic parasites. c. Most act as decomposers. d. Their filaments are composed of haploid cells. e. They are heterotrophs.
An insect that exhibits resistance to a pesticide
a. developed the resistance in response to the pesticide. b. mutated when exposed to the pesticide. c. inherited genes that made it resistant to the pesticide. d. provides an example of pest resurgence. e. is none of these.
Which type(s) of RNA is/are translated into proteins?
A) mRNA B) rRNA C) tRNA D) mRNA and rRNA E) mRNA, rRNA, and tRNA
Which of the following is a primary advantage of semisynthetic drugs?
A) They are less stable and consequently have fewer side effects. B) They work faster. C) They are more effective than the unmodified natural antibiotics. D) They must be administered intravenously. E) They are not readily absorbed.