V(J)D recombination is associated with which of the following?
A) B cells
B) macrophages
C) T cells
D) all of these
A
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In the United States, who owns the forest land that is home to timber harvesting? Why was the national forest system established, what was its mission, and who specifically directed its development? How did the political climate in the United States
aid the formation of a system that incorporated the theme of conservation?
Which of the following types of chemicals is most likely to cause a mutation?
A) a strong acid B) a strong base C) a strong oxidizing agent D) None, they are all equally likely to cause a mutation.
Which of the following is administered to patients to prevent blood clotting?
A) sodium acetate B) sodium carbonate C) sodium citrate D) sodium phosphate
Which of these lunar features is the oldest?
A) maria basins B) lunar soil C) lunar highlands D) rayed craters like Copernicus