Self-recognition is based on T cell receptors recognizing:
a. MHC markers
b. perforins
c. complement
d. naive B cells
e. antibodies
a
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Ernst Mayr was responsible for ____
a. discovering new species atop New Guinea’s Foja Mountains b. standardizing a two-part naming system c. explaining the theory of natural selection d. describing the biological species concept e. identifying that all organisms contain DNA
About twelve to twenty-four hours after the
previous meal, a person's blood-sugar level normally varies from 60 to 90 milligrams per 100 milliliters of blood, though it may rise to 130 mg/100 ml after meals high in carbohydrates. That the blood-sugar level is maintained within a fairly narrow range despite uneven intake of sugar is due to the body's ability to carry out a. adaptation. b. inheritance. c. metabolism. d. homeostasis. e. all of these processes.
Cells that remove debris, provide support, bring nutrients and produce nerve insulation are
a. neurons. b. chondrocytes. c. neuroglia. d. osteocytes. e. hepatocytes.
You are shown a micrograph from a light microscope in which the specimens appear sharply focused and nearly three-dimensional. The micrograph is probably from a(n) ________ microscope
A) dark-field B) phase-contrast C) Nomarski (differential interference contrast) D) bright-field E) atomic force