Positive selection of lymphocytes refers to the
A. processing of an antigen by a macrophage.
B. proliferation of natural killer cells.
C. production of antigen-specific antibodies.
D. survival of pre-B and pre-T cells that are capable of an immune response.
E. replication of memory cells.
D
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The walls of the alveoli are composed of
A. areolar connective tissue. B. simple squamous epithelium. C. ciliated columnar epithelium. D. stratified squamous epithelium.
Which figure exhibits concentric contraction of the biceps brachii muscle?
a) A b) B c) C d) none of these choices
Which of the following is not a mechanism for the development of autoimmune disorders?
A) exposure of previously "hidden" self-antigens to the adaptive immune system B) a second exposure to an allergen C) mutation followed by the appearance of membrane proteins not previously present D) cross-reaction of antibodies formed against foreign antigens with self-antigens
The average score of a cow's body on a body condition scoring chart is _________
Fill in the blank(s) with correct word