In which of the following ways does the developmental pathway of ?:? T cells differ from that of B cells? (Select all that apply.)
a. Their antigen receptors are derived from gene rearrangement processes.
b. When the first chain of the antigen receptor is produced it combines with a surrogate chain.
c. Cells bearing self-reactive antigen receptors undergo apoptosis.
d. MHC molecules are required to facilitate progression through the developmental pathway.
e. T cells do not rearrange their antigen-receptor genes in the bone marrow.
D,E
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Design of an effective ELISA can be challenging because
A. different detection systems have sensitivity that ranges over five orders of magnitude. B. the number of replicates required for any ELISA is quite high. C. the anticipated concentration of targets must be estimated in order to determine the sensitivity required of the assay. D. signal amplification by the assay conditions can impair interpretations. E. All of the above.
Select the suffix that means "surgical removal."
A) -centesis B) -tomy C) -ectomy D) -desis
The abbreviation BUS refers to which type of tissue in the female reproductive system?
A) adipose B) muscle C) glandular D) breast
Blockage of blood flow to the brain is known as
A) hypertension. B) stroke. C) myocardial infarction. D) atherosclerosis.