Major histocompatibility antigens are
A) antigens that provoke allergic reactions.
B) antigens that must be processed to be recognized by the immune system.
C) antigens attached to foreign invaders.
D) autoantigens involved in epitope recognition.
E) not really antigens, but rather antibodies produced to mask foreign antigens.
D
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In positional cloning, which method is used to identify clones that are progressively closer to a gene of interest?
A. Chromosome painting B. Cytogenetic mapping C. Microsatellite analysis D. Chromosome walking
Gastric bypass surgery is effective in part
because it
a. increases ghrelin levels. b. decreases ghrelin levels. c. increases leptin levels. d. decreases leptin levels. e. increases ghrelin levels and decreases leptin levels.
Certain orchids produce flowers and secrete scents that resemble female bees so that male bees will mount these
flowers and attempt to copulate with them. This bizarre occurrence is an example of: a. fertilization. b. coevolution. c. apomixis. d. self-pollination. e. asexual reproduction.
Herceptin is an example of an immune therapy
A. that works by attaching a radioactive atom to cancer cells B. that blocks the binding of a growth factor to a receptor C. that acts like a vaccine D. that identifies cells destined to undergo apoptosis