Which of the following is characteristic of a large pre-B cell?
a. VDJ is successfully rearranged and ? heavy chain is made.
b. V–J is rearranging at the light-chain locus.
c. ? heavy chain and ? or ? light chain is made.
d. V is rearranging to DJ at the heavy-chain locus.
e. D–J is rearranging at the heavy-chain locus.
A
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Which of the following accounts for the transition from membrane-bound IgM to secreted IgM upon activation of a B cell?
A. CSR B. Affinity maturation C. Alternative splicing of pre-mRNA D. Additional modification of nuclear DNA via RAG-1/2 E. None of the above
Which of the following is not a cause of low back pain?
A. physical inactivity B. poor posture C. excessive body weight D. psychological stress E. all of the above
Which term means "condition of being without blood"?
a. ahemoglobin b. erythropenia c. anemia d. hypoglycemia
The first step in assessing a responsive victim of spinal injury is to:
A) assess equality of strength. B) note the mechanism of injury. C) inspect for deformities and swelling. D) ask, "Can you feel me touching your toes?"