All of the following are true of cell communication systems EXCEPT ____
a. cell signaling occurred early in the evolution of life
b. communicating cells may be found far apart or adjacent to each other
c. most signal receptors are found bound to the outer nuclear membrane
d. protein phosphorylation is a major mechanism of signal transduction
e. in response to a signal, a cell can impact transcription of RNA
C
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Successful insertion of a DNA fragment into the polylinker region of pBluescript II is detected by
A) production of the enzyme ?-galactosidase. B) absence of the enzyme ?-galactosidase. C) the increased size of the plasmid. D) autoradiography. E) None of these
Protease inhibitors:a
inhibit the action of reverse transcriptase. b. are glycoproteins found in saliva. c. result in viral copies that cannot infect new cells. d. can cure AIDS patients. e. destroy helper T cells.
The plasma membrane is said to be freely permeable because of the channel proteins.
a. true b. false
Large numbers of small monomeric molecules join together to form large molecules that are known as ________.
A. multimers B. polymolecules C. maximolecules D. macromolecules