The secretion of __________ causes the
accumulation of fluid at the site of a wound.
a. kinins
b. histamines
c. neutrophils
d. interferons
e. leukocytes
Answer: b
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Dynamic instability of microtubules:
A. is caused by the large size of this type of cytoskeletal element. B. results from a deficiency of free tubulin subunits. C. allows microtubules to perform their functions. D. is shared by other cytoskeletal elements. E. All of these choices are correct.
Many scientists feel that we are headed toward another mass extinction because of man's actions and our effect on the ecosystem Earth. What have we learned from previous mass extinctions that may provide an idea of the consequences of such a mass extinction? What should man do to try to prevent such an occurrence?
What will be an ideal response?
Enzyme activity may be affected by
a. temperature. b. the presence of chemicals that fit into allosteric sites. c. feedback inhibition. d. metabolic conditions in the cell. e. all of these.
Particularly with regard to gas exchange, why do we have respiratory and cardiovascular systems, but flatworms, which are only a few cells thick, don't?
What will be an ideal response?