A dangerous form of food poisoning is caused by
a. Clostridium botulinum.
b. Clostridium tetani.
c. Bacillus anthracis.
d. Heliobacter pylori.
e. Thermus aquaticus.
Answer: a
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A team of researchers is studying the external structures on the dorsal (back) surface of a spider mite. The spider mite seems to be the habitat of an even smaller mite, which is approximately 0.05mm. While they can see the dorsal surface of the spider mite with their naked eye, they cannot see the mite clearly. The researchers are writing a grant to provide support for a microscope to use to study these new mites. They need to purchase a microscope with a high magnification to observe the new mites on their habitat. Based on the information given, what type of microscope would you suggest?
A. scanning electron microscope B. no microscope is powerful enough to see the smaller mite C. binocular compound light microscope D. transmission electron microscope
Human sweat has antimicrobial activity due to
A. production of an antimicrobial peptide called cathelicidins. B. production of low molecular weight compounds that chelate free iron. C. production of low molecular weight compounds that maintain an alkaline pH. D. competition with normal sweat gland flora.
When hydrogen and oxygen combine to form water, water would be
a) a product b) a reactant c) both a product and a reactant d) neither a product nor a reactant
A neuron's __________ receive signals, and its __________ transmits signals.
Fill in the blank(s) with the appropriate word(s).