What specialized structure do crustaceans use to sense gravity?
a. antennae
b. maxillae
c. mandibles
d. statocysts
e. swimmerets
d
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The number of major histocompatability (MHC) protein combinations possible in a given population is enormous. However, an individual in that diverse population has a far more limited array of MHC molecules because _____
A) the MHC proteins are made from several different gene regions that are capable of rearranging in a number of ways B) MHC proteins from one individual can only be of class I or class II C) each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene D) once a B cell has matured in the bone marrow, it is limited to two MHC response categories E) once a T cell has matured in the thymus, it can only respond to two MHC categories
To produce an allergic reaction in Type I hypersensitivity, the antigen
A. must bind to mast cells. B. must bind to free IgE molecules. C. must just bind to IgE on mast cells. D. must bind to two neighboring IgE molecules on mast cells crosslinking them.
In humans, a deletion from chromosome 5 typically leads to severe mental retardation and a malformed larynx; this
disorder is known as ____.
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome
Could two phenotypically normal parents have an affected child?
a. Yes b. No