Paired structures made of microtubules that are perpendicular to each other are called the
A) chromosomes.
B) ligand receptors.
C) centromeres.
D) nucleoli.
E) centrioles.
E) centrioles.
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The presence of an enzyme within a chemical system
A. increases activation energy. B. decreases activation energy. C. increases potential energy. D. does not affect either activation energy or potential energy.
Ventricular contraction begins at the
A. apex of the heart. B. top of the ventricles. C. base of the heart. D. AV bundle. E. superior portion of the interventricular septum.
The parasympathetic division of the autonomic nervous system ________.
A. utilizes acetylcholine as a postganglionic neurotransmitter B. includes the adrenal medulla C. has a relatively short preganglionic neuron D. utilizes norepinephrine as a postganglionic neurotransmitter
Which type of cell responds to multiple antigens?
A. Cytotoxic T-lymphocyte B. Natural killer cell C. Memory B-lymphocyte D. Memory T-lymphocyte E. Plasma cell