Eukaryotic gene expression may be controlled at all of the following levels except:
A: transcription initiation.
B: chromatin structure.
C: All of the above are levels at which genes can be regulated.
D: RNA stability.
E: RNA processing.
Answer: C: All of the above are levels at which genes can be regulated.
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Cholesterol
A) is found in abundance in prokaryotic cell membranes. B) intercalates between the fatty acid chains within the bilayer. C) increases permeability for small cations. D) destabilizes the cell membrane. E) is found only in plants.
Crossing over occurs between the ________
a. nonsister chromatids of a pair of homologous chromosomes b. sister chromatids of a pair of homologous chromosomes c. nonsister chromatids of a pair of non-homologous chromosomes d. sister chromatids of a pair of non-homologous chromosomes
The use of the birth control pill increases the
risk for all of the following cancers except
a. breast. b. cervical. c. liver. d. ovarian. e. there is no exception
Identify the structure indicated by the letter “B” in
the internal environment. a. tight junctions b. adhering junctions c. gap junctions d. homeostatic junctions e. none of these