Class II MHC proteins would be found on the surface of a:
A. cytotoxic T cell.
B. mast cell.
C. dendritic cell.
D. liver cell.
C
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In the small intestine, food molecules pass from the lumen of the intestine into the individual cells lining the intestine and then into the circulatory or lymph system of the body. If the digested molecules can leak into the abdominal cavity then ____ must have been damaged.
A. desmosomes B. focal adhesions C. hemidesmosomes D. gap junctions E. tight junctions
Groups of cells that share a common structure and function are considered to be
a. organs. b. mesenteries. c. colonies. d. tissues. e. organ systems.
In DNA, the "rungs" between the two strands of DNA are formed from the
A. hydrogen bonds between nitrogen base pairs. B. covalent bonds between nitrogen base pairs. C. ionic bonds between the phosphate pairs. D. ionic bonds between the nitrogen base pairs. E. phosphodiester bonds between the deoxyribose sugars.
A reducing medium contains
A. hemoglobin, vitamins, or other growth factors. B. sugars that can be fermented. C. extra oxygen. D. substances that remove oxygen. E. inhibiting agents.