In cancer cells, how are promoter regions silenced?
a. Histone acetylation makes DNA inaccessible.
b. Repressors bind to the promoter region making it inaccessible to RNA polymerase.
c. Methylation of cytosine DNA residues in CpG islands silences promoter regions.
d. Promoters are excised by exonuclease.
c. Methylation of cytosine DNA residues in CpG islands silences promoter regions.
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Which of the following is NOT involved in nonspecific defenses?
A. natural killer cells B. monocytes C. neutrophils D. mast cells E. B cells
A human population with a large percentage of post-reproductive individuals
A. is common in less-developed countries and will most likely increase in size. B. is common in more-developed countries and will most likely increase in size. C. is common in more-developed countries and will most likely decrease in size. D. is common in less-developed countries and will most likely decrease in size.
Which of the following have unevenly thickened primary walls that support young, growing parts of the plant?
A) parenchyma cells B) collenchyma cells C) sclerenchyma cells D) tracheids and vessel elements
Which of the following is TRUE regarding plasmids?
A. Plasmids are small, usually a few thousand to 10,000 base pairs. B. Plasmids are rarely found in prokaryotes. C. Plasmids are contained within the bacterial chromosome. D. Plasmids are linear. E. Plasmids dominate in eukaryotes.