Which of the following organisms produces a toxin that is very much like that of Shigella dysenteriae?
A) Enteropathogenic E. coli B) Enteroinvasive E. coli
C) Enterotoxigenic E. coli D) Enterohemorrhagic E. coli
D
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The primary function of the muscles covering the face is
a. chewing. b. emotional expression. c. proprioception. d. perception.
One of three quality-control results for an instrument violates the 12s rule. What is the proper course of action?
A) Continue to run samples but mark the results as "pending QC approval." B) Use a back-up instrument for running patient specimens until resolution of the problem. C) Refrain from running patient specimens until resolution of the problem. D) Because the 12s rule is only a warning, continue running patient specimens.
What are the two major limitations associated with coefficient alpha?
What will be an ideal response?
A first-degree heart block has a PR interval greater than 0.20 seconds because:
A) depolarization of the atria occurs at a slightly slower rate than one would expect. B) each impulse that reaches the AV node is delayed slightly longer than expected. C) impulses generated by the SA node traverse the AV node at an accelerated rate. D) the primary pacemaker is not the SA node, but rather an ectopic atrial pacemaker.