What are on the surface of most vertebrate cells, acting as markers of "self"?
A. major histocompatibility complex proteins
B. T-cell receptors
C. antigens
D. immunoglobulins
A. major histocompatibility complex proteins
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Which are main colors of light absorbed by rod
cells?
a. red, green, blue b. blue, yellow, red c. yellow, orange, brown d. green, blue, white e. none of these colors of light are absorbed by rod cells
Replacement-level fertility requires a total
fertility rate of a. 2.0 b. 2.1 c. 2.4 d. 2.6 e. 2.8
Organelles do all of the following EXCEPT
a. manufacture proteins. b. sustain internal microenvironments. c. control import and export of materials. d. transport substances. e. all of the above functions are performed by organelles.
Cloned B cells which produce antibodies that are specific to a particular antigen are called _______ cells.
Fill in the blank(s) with the appropriate word(s).