In response to the presence of extracellular antigen, B cells rapidly proliferate and the immunoglobulin M (IgM) proteins produced are soluble rather than anchored in the membrane.This change in IgM protein state is due to:
A. the cleavage of several hydrophobic amino acid residues from the IgM protein.
B. the differential expression of two different IgM genes.
C. the predominant use of the first 3' end cleavage site of the IgM pre-mRNA.
D. inclusion of the M exon in mature IgM mRNA.
C
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Which of the following statements is false?
A. Oxygen debt is the difference between an animal's immediate need for oxygen at the start of activity versus energy supplied by anaerobic metabolism. B. Recovery metabolism involves increased heart rates and respiration rates. C. An animal's oxygen consumption remains elevated for a brief period after activity ends. D. Recovery metabolism allows a cell to replenish depleted ATP stores and metabolize lactic acid. E. None of these statements is false.
Antibodies are
a. proteins. b. steroids. c. polysaccharides. d. lipoproteins. e. any of these.
Once a phage genome has become part of the host chromosome, it is called a ________
Fill in the blank(s) with correct word
A plasma cell is a cell that has differentiated from a:
A) mast cell. B) T cell. C) B cell. D) dendritic cell.