Which of the following is a disease specifically caused by an autoimmune response against acetylcholine receptors?
A) Grave's disease
B) myasthenia gravis
C) systemic lupus erythematosus
D) Hashimoto's thyroiditis
E) celiac disease
B) myasthenia gravis
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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.
Calmodulin is a:
a. hormone. b. calcium-binding protein. c. phosphatase. d. protein kinase. e. phospholipase.
The International Committee on Taxonomy of Viruses has determined that there are only three orders of viruses.
Answer the following statement true (T) or false (F)
Atoms are to molecules as __________.
A. atoms are to tissues B. tissues are to cells C. organ systems are to cells D. tissues are to organs E. cells are to organ systems