Histone deacetylase inhibitors are a class of drugs used as mood stabilizers and anti-epileptics that are also being researched for their efficacy as anti-cancer agents. Histone deacetylase inhibitors block the action of histone deacetylases, which remove acetyl groups from lysine residues in histone tails. How will blocking histone deacetylases affect gene expression in the cell?
A. Chromatin will become more tightly compact, and gene expression will be increased.
B. Chromatin will become more tightly compact, and gene expression will be reduced.
C. Chromatin will become more methylated, and gene expression will be decreased.
D. Chromatin will become more open, and gene expression will be increased.
E. Chromatin will become more open, and gene expression will be reduced.
Answer: D
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As N approaches K for a certain population, which of the following is predicted by the logistic equation?
A) The growth rate will not change. B) The growth rate will approach zero. C) The population will show an Allee effect. D) The population will increase exponentially. E) The carrying capacity of the environment will increase.
Actinomycete spores are usually formed on ________ mycelia.
Fill in the blank(s) with the appropriate word(s).
Escherichia coli biochemical studies have added immeasurably to:
a. the definition of genes. b. the definition of gene activities. c. the identification of biochemical pathways. d. all of these e. none of these
Drosophila eggs acquire an initial asymmetry before fertilization as a result of
A. maternal DNA molecules being deposited in one end of the egg. B. nurse cell migration to one end of the egg. C. production of bicoid proteins in one end of the egg. D. attachments of cadherins to one end of the cell. E. maternal mRNA being deposited in one end of the egg.