In positive selection of T-lymphocytes, those cells that
A. bind self antigens are eliminated.
B. can bind MHC survive.
C. bind to self antigens survive.
D. bind to MHC class II are eliminated.
B
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The hard substance covering the crown of a tooth is called __________.
Fill in the blank(s) with the appropriate word(s).
The amount of a substance excreted from the kidneys is calculated by which of the following 131) equations?
A) filtration + secretion - reabsorption B) filtration - (secretion × reabsorption) C) filtration + secretion + reabsorption D) filtration - secretion - reabsorption E) filtration + (secretion × reabsorption)
Sweat cools the body by
A. radiation. B. convection. C. evaporation. D. conduction.
There are two types of synapses, based on mode of communication. What are they?
A. Mechanical and chemical B. Magnetic and physical C. Physical and chemical D. Chemical and electrical E. Mechanical and electrical