The peptides presented by MHC class II peptide molecules are

A. from plasma cells.
B. exogenous antigens.
C. endogenous antigens.
D. from T helper cells.


B

Biology & Microbiology

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Most intertidal chitons are considered

a. grazers. b. predators. c. scavengers. d. filter feeders. e. infauna.

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Children who are pituitary dwarfs can now grow to normal height because of

A) large supplies of growth hormone from dead animals. B) the invention of synthetic growth hormone. C) genetic repair before birth. D) genetically engineered production of growth hormone by bacteria. E) pituitary transplants.

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Thrombin catalyzes the conversion of the plasma protein fibrinogen into fibrin

Indicate whether the statement is true or false

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Which of the following is not part of a nephron?

A. proximal convoluted tubule B. ureter C. collecting duct D. loop of Henle E. glomerular capsule

Biology & Microbiology