Which of the following is a mitochondrial disease?
a. Lou Gehrig's disease
b. Leber's hereditary optic neuropathy
c. Crohn's disease
d. I-cell disease
Ans: b. Leber's hereditary optic neuropathy
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Which of the following chemical differences contribute to increased structural variety of RNA over DNA?
A. In addition to the double-stranded regions, virtually all of the unpaired bases are involved in base stacking interactions, increasing the variety and stability of RNA. B. Since RNA molecules have no pucker the sugar molecules are flat and can add to stacking stabilization. C. Base stacking contributes less to RNA stability because fewerbases are paired. D. Because ribose has one less hydroxyl group there are fewer opportunities for RNA to hydrogen bond. E. Different sugar puckers cause the phosphates in the RNA backbone to be farther apart.
A woman with blood type B has a baby with blood type O. A man she says is the baby's father has blood type A, but he denies having fathered the child. Could he be the father?
What will be an ideal response?
What organism is the MOST important reservoir for Borrelia burgdorferi?
a) Tick b) Rabbit c) Squirrel d) Field mouse
The HIV virion attaches to ________ on the surface of lymphocytes
A) IgG B) MHC II C) IL-2R D) CD4 E) CD3