Within a genome, an enhancer may be located
A) upstream of the gene enhanced.
B) downstream of the gene enhanced.
C) within the introns of other genes.
D) proximal to the gene enhanced.
E) upstream or downstream of the gene enhanced, even within the introns of other genes.
Answer: E
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T cells undergo maturation in the bone marrow.
Answer the following statement true (T) or false (F)
A cross of two Kerry horses always produces Kerry offspring. A cross of a Kerry with a Dexter produces 1/2 Kerry and 1/2 Dexter offspring. Crosses of two Dexters produce two Dexters for every Kerry. This pattern of inheritance, in which the F2 generation deviates from the expected ratios, suggests a _______ homozygous recessive trait.
Fill in the blank(s) with the appropriate word(s).
A newly-generated T cell can recognize MHCs and is not self-reactive. What is its fate?
A) It is signaled for destruction via apoptosis. B) It will migrate to the lymphoid tissues to await activation by its antigen. C) It will undergo genetic shuffling to change its receptor to increase self-tolerance. D) It will become part of an autoimmune attack in the body's tissues at some time in the future. E) It will migrate to the bone marrow for screening for the ability to make antibodies against self-antigens.
An individual antibody is made against _______.
A. a whole bacterial cell B. one epitope on the cell C. one antigen on the cell D. all of the combined antigenic determinants on a cell E. the cell's DNA