Syncope is probably NOT caused by a life-threatening dysrhythmia if it occurs:
A) immediately after a person is startled.
B) following exercise or heavy exertion.
C) in a person whose cousin has syncope.
D) in conjunction with chest pain or pressure.
Answer: C) in a person whose cousin has syncope.
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Which of the following structures is NOT a component of the hindbrain?
A. pons B. medulla oblongata C. ascending tracts D. cerebellum
In the human eye, what provides the greatest visual acuity (the precise discrimination between adjacent
points in space)? a. photoreceptors in the sclera b. photoreceptors in the fovea c. protein filaments in the lens d. photoreceptors in the optic nerve e. photoreceptors throughout the retina
In the lac operon in E. coli, a nonsense mutation in the ________ gene will result in a loss of ß-galactosidase activity in the cell
A) lacZ B) lacI C) lacY D) Both A and B E) All of these
The primary function of cell-mediated immunity is to
A) protect the body against extracellular parasites. B) decrease the amount of complement. C) destroy cancerous or virus-infected host cells. D) increase the number of macrophages. E) promote the production of antibodies.