Which protein is defective in cases of Duchenne muscular dystrophy?

a. dystrophin
b. albumin
c. fibrillin
d. fibrinogen
e. fibrin


ANSWER: a

Biology & Microbiology

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What effect does the nervous system have on the heart rate?

A. Stimulation by parasympathetic nerves causes the heart rate to slow down. B. Stimulation by sympathetic nerves sets the resting heart rate of the pacemaker cells in the SA node. C. Stimulation by sympathetic nerves causes the pacemaker cells of the AV node to depolarize more rapidly than the pacemaker cells of the SA node. D. Stimulation by either the sympathetic or parasympathetic nerves causes pacemaker cells in the SA node to depolarize more slowly. E. The nervous system does not directly affect the heart rate.

Biology & Microbiology

During conscious, quiet rest, the brain is emitting:a

alpha waves. b. beta waves. c. delta waves. d. gamma waves. e. rapid, irregular waves.

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_____ is when antibodies are directed to the base membranes in organs.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the below is not one of the basic pathways through which people are exposed to radiation

a. inhalation b. absorption c. ingestion d. direct

Biology & Microbiology