What might be the result if cells that you are culturing acquire a mutation in a protein-tyrosine kinase that prevents the protein from being regulated in a normal fashion and keeps it continually in an inactive state?
a) a significant decrease in cell size
b) cessation of cell division
c) transformation into cancer cells
d) uncontrolled cell division
Ans: b) cessation of cell division
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What is the normal bodily PH?
DNA microarrays may be paired with chromatin immunoprecipitation (ChIP) to
A. assay the use of substrates by different enzymes. B. determine mRNA folding patterns C. identify DNA sequences bound by specific proteins D. identify protein-protein interactions.
Which of the following is false?
a. All mammals have either an estrous or a menstrual cycle. b. Some primates have a menstrual cycle. c. Some female primates may be physically and behaviorally receptive to sexual activity at any time. d. About 10% of detected pregnancies end in miscarriage. e. Mifepristone (RU-486) is approved to indiuce abortion any time during the first six months.
Which description best illustrates the product of a chemical reaction?
a. It is joined by an ionic bond only. b. It is always in equilibrium with the reactants. c. It is the substance that initiates the reaction. d. It is generally written on the left side of the equation. e. It is generally written on the right side and is the substance generated by the reaction.