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The ability of glucose to repress the lac operon depends on which effector molecules?


A) allolactose
B) cAMP
C) tryptophan
D) ADP
E) starch

F) C) and E)
G) C) and D)

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The lacA gene found within the lac operon encodes for galactosidase transacetylase.This enzyme attaches a(n) ________ group to lactose and lactose analogs.


A) amino
B) hydroxyl
C) carbonyl
D) acetyl
E) carboxyl

F) All of the above
G) B) and D)

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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 reduced
B) Chromatin will become more tightly compact,and gene expression will be increased
C) Chromatin will become more open,and gene expression will be reduced
D) Chromatin will become more open,and gene expression will be increased
E) Chromatin will become more methylated,and gene expression will be decreased

F) All of the above
G) B) and C)

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