Select the best response to the question.
In which of the following situations is the sterile field disrupted?
A) A contaminated instrument is handed to the assistant away from the field.
B) The assistant drops additional sterile gauze in the center of the field.
C) The surgeon reaches behind his/her body to grab more sterile gauze.
D) The surgeons holds all instruments upright when handling them.
C
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The first plant to colonize the plains of Mt St
Helens after this volcano erupted in 1980 was a prairie lupine. The prairie lupine is an example of
a. a secondary successor. b. a pioneer species. c. a keystone species. d. an exotic species. e. more than one of these.
Which of the following is NOT unique to
angiosperms?
a. endosperm b. a cell within the female gametophyte that has two nuclei c. pollen tubes d. double fertilization e. more than one of these is NOT unique to angiosperms
Feedback inhibition prevents cells from
A) the harmful effects of enzyme activation by covalent modification of unneeded enzymes. B) making products that are not needed by inhibiting the activity of enzymes in biosynthetic pathways allosterically. C) destroying enzymes by proteolytic cleavage when they are needed in biosynthetic pathways. D) accumulating unnecessary proteins. E) irreversibly inhibiting critical enzymes.
The term ________ variable refers to one of two variables involved in an experiment, in which neither variable can be isolated as having an effect
A) multiple B) confounding C) blind D) statistical