The virulence factor associated with enterohemorrhagic Escherichia coli diarrhea resembles a virulence factor from which of the following bacteria?
A. Enterobacter aerogenes
B. Klebsiella pneumoniae
C. Salmonella typhi
D. Shigella sonnei
E. Vibrio cholera
Ans: D. Shigella sonnei
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Which of the following terms does not apply to organisms in the Phylum Amoeboza?
(a) chlorophyll. (b) phagocytosis. (c) pseudopodia. (d) slime mold.
Which of the following describe a role that ethylene plays in plant physiology. Check all that apply.
_____ Retarding stem and root elongation. _____ Hastening the ripening of fruit. _____ Inhibition of leaf abscission. _____ Inhibition of lateral bud growth. _____ Accelerates the loss of damaged fruits.
The impact of a large asteroid comet with Earth has been proposed to have caused the extinction of the dinosaurs. The impact site of this comet is in or near
a. Iowa. b. Hudson Bay. c. Crater Lake, Oregon. d. Canberra, Australia. e. Chicxulub, Mexico.
What is a characteristic of REM sleep?
a. During the REM stage, delta waves are emitted. b. Most people spend almost all of their sleep time in the REM stage. c. The preoptic area of the hypothalamus stimulates REM sleep. d. During REM sleep, blood flow to the frontal lobe increases. e. Brain waves change to a desynchronized pattern during REM sleep.