Rapid cell proliferation can result from
a. a mutation inhibiting the action of a positive growth regulator.
b. the surgical removal of a benign polyp.
c. contact inhibition.
d. a cell ignoring a negative growth regulator.
Answer: d. a cell ignoring a negative growth regulator.
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Nonspecific cell responses depend on the actions of lymphocytes, natural killer cells, and dendritic cells. Indicate whether the statement is true or false
Choose the letter of the best match from the following:A. hotspotB. habitat lossC. edge effectsD. megafaunal extinctionE. extinction vortexPrimarily due to habitat destruction, pollution, human disruption, fragmentation.
Fill in the blank(s) with the appropriate word(s).
Which of the following processes is involved in the bulk transport of molecules out of the cell?
a. phagocytosis b. pinocytosis c. receptor-mediated endocytosis d. exocytosis e. None of these are correct.
What statement does not correctly describe hormones that can directly enter a cell?
A. Steroid hormones can enter directly into cells because of their hydrophobic makeup. B. Water-soluble hormones can enter directly into cells because of their nonpolar makeup. C. Once these hormones enter a cell, they bind to a cytoplasmic receptor and travel as a complex to the nucleus, or they may bind to the receptor after entering the nucleus. D. Steroid hormones dissolve poorly in the plasma and are transported to target cells via special protein carriers.