Which of the following STDs is (are) caused by a
bacterium?
a. syphilis
b. gonorrhea
c. chlamydia
d. all of these
e. none of these
Answer: d
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Which of the following statements about the auxin indole-3-acetic acid (IAA) is false? a. It is involved in polarity and tissue patterning in the embryo
b. IAA can exert different effects at different concentrations. c. IAA is made mainly in root tips and young roots. d. It causes cells to expand by increasing activity of proton pumps.
Which layer of the mammalian gut performs peristalsis?
a. mucosa b. muscularis c. serosa d. submucosa e. submucosa and muscularis
When cells begin to move in the embryo in relation to other cells, this is called
A. growth. B. cleavage. C. morphogenesis. D. fertilization. E. differentiation.
In which of the following diseases can gender be considered a viable predisposing factor?
A) urinary tract infections B) pneumonia C) salmonellosis D) tetanus E) anthrax