With second exposure to the antigen, the antigen molecules bind to:
A. IgE on the helper T cells
B. IgE on the mast cells
C. IgE on the plasma cells
D. IgE on the antigen-presenting cells
Answer: B. IgE on the mast cells
You might also like to view...
Diatoms have both chorophyll a and chlorophyll ________.
Fill in the blank(s) with the appropriate word(s).
Members of the ____ lineage, including slugs and snails, may have a shell, and most undergo torsion during
development.
a. Cephalopoda b. Polyplacophora c. Platyhelminthes d. Gastropoda e. Scaphopoda
Liverworts and mosses utilize which of the following pigments for photosynthesis?
a. chlorophylls a and b. b. carotenes. c. xanthophylls. d. all of the above.
You are given the chemical code of one-half of a DNA double helix: CATGATTACCTAGAATCCTGTAAT. Which of the following sequences represents the codons and anticodons that would be used in creating a protein if the other half of the DNA strand is the coding strand?
A. mRNA codons: CATGATTACCTAGAATCCTGTAAT tRNA anticodons: CATGATTACCTAGAATCCTGTAAT B. mRNA codons: CAUGAUUACCUAGAAUCCUGUAAU tRNA anticodons: GUACUAAUGGAUCUUAGGACAUUA C. mRNA codons: CATGATTACCTAGAATCCTGTAAT tRNA anticodons: CAUGAUUACCUAGAAUCCUGUAAU D. mRNA codons: GUACUAAUGGAUCUUAGGACAUUA tRNA anticodons: CAUGAUUACCUAGAAUCCUGUAAU