388.In myasthenia gravis, autoantibodies are directed against which of the following structures?

A.Sarcomere
B.Acetylcholine receptor C.Myocyte nucleus
D.Sarcolemmal membrane  

Ans-B.Acetylcholine receptor

387.Cerebral embolism occurring as a complication of myocardial infarction is MOST indicative of which of the following?

 A.Mural thrombosis
B.     Phlebothrombosis
C.Decreased stroke volume
D.     Lack of collateral circulation

Ans-a.Mural thrombosis

386. Excessive deposits of copper in liver cells, degenerative changes in the brain, and a greenish-brown ring at the outer margin of the cornea characterize which of the following?

 A Galactosemia
B.     Phenylketonuria
C. Wilson's disease
D.     Diabetes mellitus

Ans-c.wilson's disease