What is the function of histone methylation? What is its connection to DNA methylation?
What will be an ideal response?
Ans: Methylated histones are associated with inactive sections of DNA, such as heterochromatin (as is methylated DNA), or with activated genes. Methylation of histones and of DNA is connected, as DNA methylation can result in histone methylation.
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Which external factors influence a cell to divide?
What will be an ideal response?
A concentration gradient ceases to exist when
a. all molecules have moved from low concentration to high concentration. b. the membrane pores close. c. the temperature drops. d. there is equilibrium between the two sides of a membrane. e. bulk flow intervenes.
Which of the following clusters of terms apply when addressing enhancers or silencers as elements associated with eukaryotic genetic regulation?
A) cis-acting, fixed position, fixed orientation B) trans- and cis-acting, variable position C) trans-acting, fixed position, fixed orientation D) cis-acting, variable position, fixed orientation E) cis-acting, variable orientation, variable position
How does a noncompetitive inhibitor limit an enzyme's activity?
A. A noncompetitive inhibitor binds to the active site of an enzyme. B. A noncompetitive inhibitor binds to the substrate, preventing it from binding to the enzyme. C. A noncompetitive inhibitor binds to a coenzyme or cofactor, preventing it from binding to the enzyme. D. A noncompetitive inhibitor binds to an allosteric site of the enzyme.