Protein X contains four transmembrane domains, a short N-terminus and a long C-terminus. Following protein synthesis, the N-terminus of the protein faces the lumen (the inside) of the ER. After protein X is transported to the cell surface via exocytosis, you would expect the N-terminus of protein X to be
A. in the lipid bilayer of the plasma membrane.
B. in the lumen.
C. cytoplasmic.
D. extracellular.
Answer: D
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Which of the following is TRUE regarding the step in gene cloning when bacterial cells take up recombinant vector?
A. The process is known as transformation when a viral vector is used. B. The process is known as transfection when a plasmid vector is used. C. The cell is treated with agents that render it impermeable to the plasmid. D. The cell is treated with agents that render it permeable to the plasmid. E. Most cells will successfully take up one plasmid.
The decline in the occurrence of sickle-cell anemia in the American population is most likely the result
of
a. a lower mutation rate in the United States than in Africa. b. the advantage of both homozygous forms over the heterozygous form. c. the development of appropriate medical treatment for the sickle-cell condition in the United States. d. a decline in the occurrence of malaria in the United States. e. the absence of mosquitoes.
Which of the following structures all contain valves?
a. arteries and veins b. arteries and heart c. arteries, capillaries, heart d. lymph capillaries, arteries, heart e. lymph capillaries, veins, heart
A SNP results in a loss of the XhoI site indicated in the bacterial plasmid below. You design a molecular probe that spans the lost XhoI site
Which lane represents the expected Southern blot of a bacterial cell that carries two copies of the plasmid: a normal version and the version with the lost XhoI site?