Which of the following statements about B cells is true?
a. B cells target pathogens in lymph.
b. B cells are involved in the cell-mediated immune response.
c. B cells target and destroy infected cells.
d. B cells bind antigens in MHC molecules.
a. B cells target pathogens in lymph.
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The S. aureus product that causes scalded skin syndrome is/are
A. exfoliation toxin. B. lipases. C. leukocidins. D. protein M. E. All of the choices are correct.
Identify the site indicated by the arrow in the diagram
a. complement binding site of an antibody b. antigen binding site of an antibody c. MHC binding site of an antigen d. complement binding site of T cell receptor e. MHC binding site of a T cell receptor
In automated DNA sequencing, eventually there will
be millions of DNA fragments all tagged at a. one end. b. both ends. c. every nucleotide. d. the most numerous nucleotide. e. the least numerous nucleotide.
Why is the unknown in this example not Pseudomonas?
a. It is a rod-shaped cell. b. It can tolerate oxygen. c. It ferments lactose. d. It is a Gram-negative cell.