The natural antibodies in serum that react with A or B polysaccharide antigens are mostly of the class
A. IgG.
B. IgE.
C. IgM.
D. IgD.
E. IgA.
C
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Humoral immunity is mostly the function of
A. cytotoxic T cells. B. B cells. C. MHC I. D. complement cells. E. mast cells.
Four of the five answers listed below are components of the mixture used in Miller and Urey's experiment. Select the exception
a. ammonia b. methane c. water d. hydrogen e. oxygen
Males more commonly are affected by Xlinked
recessive genetic disorders than are females because
a. females have two X chromosomes and thus less of a chance to be recessive. b. males have only one X and thus more of a chance to be recessive. c. males have only one X, they have multiple alleles for each gene. d. Y chromosomes cause X gene mutations. e. males are weaker genetically than females
All of the following are fundamental properties of cells except:
A) Cells evolve B) Cells are capable of producing more of themselves C) Cells can respond to stimuli D) Cells acquire and use energy E) Cells are simple