The portions of an antigen's exposed surfaces to which its specific antibody binds are regions called
A) opsonins.
B) the constant segments of the light and heavy chains.
C) antigenic-determinant sites.
D) complement-binding sites.
E) antigen-binding sites.
C) antigenic-determinant sites.
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Up-regulation of receptors
A) Results in increased sensitivity to its ligand. B) Results in decreased sensitivity to its ligand. C) Occurs when a ligand has been present at high levels. D) Both B and C
Fertilization typically occurs in the _________, and it restores the _________ number of chromosomes
A. ampulla of the uterine tube; haploid B. ampulla of the uterine tube; diploid C. body of the uterus; polyploid D. isthmus of the uterine tube; haploid E. isthmus of the uterine tube; polyploid
Fill in the missing blood vessel.Hepatic vein; ________; right atrium
Fill in the blank(s) with the appropriate word(s).
What branch of physiology would study the effects of sunbathing on the skin?
A. cell physiology B. systemic physiology C. regional physiology D. organ physiology