The central nervous system contains:a
all sympathetic nerves.
b. all parasympathetic nerves.
c. all sensory receptors.
d. only the cerebrum and cerebellum.
e. a brain and a dorsal tubular spinal cord.
e
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What occurs in Duchenne muscular dystrophy?
a. muscle fibers break down b. motor neurons stop signaling muscle fibers c. actin filaments do not form d. myosin filaments do not form e. calcium does not leave the endoplasmic reticulum
The key gene in mammalian sex determination is
A) the testis-determining factor gene. B) the Y-factor gene. C) the holandric factor gene. D) the X-inactivation center. E) the lyonization gene.
Pathogenic microorganisms and their hosts live in a close association with one another known as:
A. sociality B. commensalism C. biofilms D. parasitism E. mutualism