Which of the following mechanisms is most likely related to retinoblastoma?
A. Persistent activation of the Ras gene
B. Increased production of epidermal growth factor
C. Decreased susceptibility to apoptosis
D. Impaired functioning of mismatch repair genes
E. Inactivation of the Rb gene
Ans: E. Inactivation of the Rb gene
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The most common type of polyploidy in humans is ____
a. trisomy b. monosomy c. triploidy d. tetraploidy e. haploidy
With ____, individual cells can be coaxed to divide and form embryos in a laboratory.
A. in vitro fertilization B. sexual reproduction C. tissue culture propagation D. vegetative reproduction E. grafting
Decorative plants and exotic pets often suffer from overexploitation.
Answer the following statement true (T) or false (F)
How is the central portion of a T cell receptor complex functionally analogous to the center of the B cell receptor complex?
A. It has two pieces (chains), just like a B-cell receptor. B. Both receptors bind epitopes (small amino acid sections of antigen molecules). C. Both bind structures directly on the surface of microbes. D. Both can be secreted from lymphocytes to bind to pathogens under certain situations.