The local mediator nitric oxide stimulates the intracellular enzyme guanylyl cyclase by ________________
(a) activating a Gprotein.
(b) activating a receptor tyrosine kinase.
(c) diffusing into cells and stimulating the cyclase directly.
(d) activating an intracellular protein kinase.
(c)
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The two proteases in the small intestine that complete protein digestion are ____
a. aminopeptidase and dipeptidase b. aminopeptidase and disaccharidase c. dipeptidase and disaccharidase d. dipeptidase and phosphatase e. nucleotidase and nucleosidase
List the zones that comprise rocky shores. Which of the zones would you expect to have the highest species diversity and which would have the lowest species diversity? Explain your answer
What will be an ideal response?
All of the following protect the skin and mucous membranes from infection EXCEPT
A) multiple layers of cells. B) tears. C) saliva. D) HCl. E) the "ciliary escalator."
Which of the following is not a factor contributing to the loss of biodiversity?
A. overexploitation B. disease C. pollution D. alien species E. increased carrying capacity