Membrane-bound receptors
A. are small, lipid soluble molecules.
B. have no effect on the cell.
C. do not exhibit specificity.
D. have their receptor sites on the outer surface of the plasma membrane.
E. can interact with DNA in the nucleus.
D
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The largest arteries of the body are classified as
A. muscular arteries. B. arterioles. C. elastic arteries. D. muscular and elastic because they have the same dimensions. E. None of the answers is correct.
A. are more likely to lodge in the right primary bronchus. B. are more likely to lodge in the left primary bronchus. C. lodge equally often in each of the two primary bronchi
A. The right lung has two secondary bronchi and the left lung has three secondary bronchi. B. The left lung has two secondary bronchi and the right lung has three secondary bronchi. C. Each lung has two secondary bronchi. D. Each lung has three secondary bronchi. E. Each lung has four secondary bronchi.
The multiple nuclei in skeletal muscle cells are the result of the
A. fusion of myoblasts. B. cytokinesis of embryonic satellite cells. C. spontaneous development of nuclei in embryonic cells. D. stimulation of fibroblasts by hormones. E. action of testosterone on mesenchyme cell.
Cells that lack ribosomes cannot
A. ingest and phagocytize bacteria. B. produce energy. C. eliminate wastes. D. package cellular products. E. engage in protein synthesis.