Which one of the following types of post-transcriptional modification is common in eukaryotes?
A. polyadenylation
B. intron removal
C. 5' cap addition
D. polyadenylation and intron removal
E. All of these choices are correct.
Answer E
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An allosteric inhibitor
A) increases the rate of substrate binding. B) binds and activates the high-affinity state of the enzymes. C) is identical to the active site. D) binds at the regulatory site. E) is converted to an activator by the enzyme.
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.
a versatile plant compartment that may hold reserves of organic compounds or inorganic ions
A. lysosome B. vacuole C. mitochondrion D. Golgi apparatus E. peroxisome
Some drugs used in chemotherapy stop cell division by affecting the cytoskeleton. The drugs would cause functional disabilities in which of the following?
A) flagella B) cilia C) neither flagella nor cilia D) both flagella and cilia