Depending on the type of receptor to which it binds, the same neurotransmitter may repolarize or
hyperpolarize potentials in the postsynaptic cell.
Indicate whether the statement is true or false.
ANS: F, depolarize
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What contains both vector DNA and chromosomal DNA?
A. recircularized vectors B. recombinant vectors C. open vectors
OMIM is an acronym that stands for ____________. Fill in the blank(s) with the appropriate word(s)
Which of the following statements about DNA libraries is true?
(a) Production of a DNA library involves the direct insertion of short DNA fragments into bacteria through transformation. (b) By placing the library DNA into bacteria, the bacteria can be used to amplify the desired DNA fragments from the DNA library. (c) Individual bacteria that have taken up most of the library DNA are selected for during the construction of a DNA library. (d) The library DNA within the bacteria will only be replicated when it hybridizes to a DNA probe.
Which of the following statements is true?
(a) Extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior. (b) To function, all extracellular signal molecules must be transported by their receptor across the plasma membrane into the cytosol. (c) A cell-surface receptor capable of binding only one type of signal molecule can mediate only one kind of cell response. (d) Any foreign substance that binds to a receptor for a normal signal molecule will always induce the same response that is produced by that signal molecule on the same cell type.