What is the most common fatal genetic disorder in the U.S.?
a. Cystic fibrosis
b. Huntington's disease
c. Parkinson's
d. Diabetes
e. Down's syndrome
a
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How is a T cell receptor similar to an IgM?
A. Both are produced by T cells. B. Both can bind to a specific antigen. C. Both are organized with variable and constant segments. D. Two answer options are correct: both can bind to a specific antigen AND both are organized with variable and constant segments.
A pulmonary fungus ball and external otomycosis and onychomycosis are all infections caused by which genera?
a. Fusarium b. Penicillium c. Paecilomyces d. Aspergillus
Generally, an atom carries no charge because it has as many electrons as
a. neutrons. b. orbitals. c. shells. d. protons. e. neutrinos.
Acetylcholine is a signaling molecule that elicits responses from heart muscle cells, salivary gland cells, and skeletal muscle cells. Which of the following statements is false?
(a) Heart muscle cells decrease their rate and force of contraction when they receive acetylcholine, whereas skeletal muscle cells contract. (b) Heart muscle cells, salivary gland cells, and skeletal muscle cells all express an acetylcholine receptor that belongs to the transmitter-gated ion channel family. (c) Active acetylcholine receptors on salivary gland cells and heart muscle cells activate different intracellular signaling pathways. (d) Heart muscle cells, salivary gland cells, and skeletal muscle cells all respond to acetylcholine within minutes of receiving the signal.