The majority of mature, self-tolerant lymphocytes are found in
A) the MALT.
B) lymph nodes.
C) the thymus.
D) the spleen.
E) the tonsils.
A
Bloom's Taxonomy: Comprehension
Section: Elements of Adaptive Immunity
Learning Outcome: 16.6
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If a cell is fused with another cell, which of the following would be the best example of a trans-mechanism of epigenetic control?
A. A gene that is originally silenced in one cell but expressed in the other is silenced in the hybrid B. A gene that is originally silenced in one cell but expressed in the other is still expressed in the hybrid. C. The methylation pattern of the same gene from either cell is not altered D. There are no examples that could conform to a trans-mechanism
The reason that an action potential is so brief is that
a. a wave of repolarization immediately follows the rising portion of the spike. b. the closing of potassium gates allows the voltage difference across the neural membrane to be restored. c. the channels for sodium movement remain open. d. the sodium-potassium pump restores the electrical gradients. e. the membrane limits electrical activity.
Which function of the skeletal system requires the leg bones to be extremely strong?
A. They store minerals and fat. B. They support the entire body. C. They protect soft body parts. D. They permit flexible body movement. E. They produce blood cells.
Gene therapy involves:a
replacing all mutant alleles in body cells. b. replacing poor copies of alleles with normal alleles. c. replacing a mutant allele in certain body cells with a normal allele. d. repairing mutant alleles in certain body cells. e. improving gene expression in key body cells.