In multiple sclerosis, autoantibodies attack
A. acetylcholine receptors on smooth muscle.
B. sodium pump proteins in the cell membrane.
C. myelin sheath cells of the nervous system.
D. acetylcholine receptors on skeletal muscle.
E. cells in thyroid follicles.
Answer: C
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Which method would be LEAST effective at sterilizing a glass hockey stick to use in the spread-plate method?
A) autoclaving B) gamma radiation C) ethanol soaking D) ultrahigh-temperature pasteurization
Five species of ants can be found on aspen sunflowers (Helianthella quinquenervis), which live in wet mountain meadows of the Rocky Mountains. The aspen sunflowers provide nectar to the ants in special structures called extrafloral nectaries
The ants, in turn, protect the sunflowers from other insects. The ants, however, are not found solely on the sunflowers—they can be found tending aphids on other flower species and collecting nectar from other species as well. This, then, is an example of a(n): A. obligate mutualism B. obligate antagonism C. facultative mutualism D. facultative antagonism E. none of the answer options are correct.
Gel electrophoresis separates DNA fragments according to their ________.
A. charge B. length C. base sequences D. polarity
The space between the two membranes of the mitochondrion accumulates ____
a. proteins b. H+ c. carbohydrates d. H2O2 e. CO2