Which of the following organs have cells that can be infected by Chlamydia trachomatis?
A. eyes
B. trachea
C. rectum
D. urethra
E. eyes, trachea, rectum, and urethra.
Answer: E
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In which one of the following cellular processes is RNA involved?
A. transcription B. translation C. DNA replication D. transcription and translation E. All of these choices are correct.
Which of the following is not true of enterotoxigenic E. coli (ETEC)?
A. It can be life-threatening in infants. B. Fluid replacement is vital to surviving an infection. C. It causes traveler's diarrhea. D. It causes a high fever.
Which is a disadvantage of air as a respiratory medium?
a. Air evaporates water from the respiratory surface. b. Air contains 30 times as much O2 as water. c. Air is 1000 times less dense than water. d. Air requires less energy to ventilate over the respiratory surface. e. O2 diffuses more rapidly in air than in water.
Mutations can be
a. random. b. beneficial. c. lethal. d. heritable. e. all of these.