Which respiratory control center is most sensitive to changes in CO2?
a. aortic bodies
b. carotid bodies
c. receptors of the medulla
d. receptors of the aorta
e. medulla bodies
C
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Methicillin is a medicine that inhibits cell wall production. Why does this make it a suitable antibiotic for eliminating bacterial infections in humans?
A. Human cells do not have cell walls. B. Human cells and bacterial cells are completely different, so methicillin does not affect human cells. C. All humans have a gene giving methicillin resistance. D. Human cells have a plasma membrane in addition to the cell wall that allows them to survive in the presence of methicillin. E. The cell wall of human cells is not sensitive to methicillin.
As temperatures increase during seasonal fluctuations in marine environments,
A) both species richness and species dominance increase. B) species richness increases and species dominance decreases. C) species richness decreases and species dominance increases. D) both species richness and species dominance decrease.
In which one of the following are both important for eukaryotic mRNA stability and translation?
a. promoter and 5'cap b. promoter and 5'UTR c. 5'cap and polyA tail d. introns and 3'UTR
Allergies are acquired following:
A) most bacterial infections. B) initial exposure to an allergen. C) indirect exposure to an allergen. D) repeated exposure to an allergen.