Detection of allergens by mast cells causes ____
a. release of histamine and cytokines
b. decreased mucous secretion
c. widening of the airways
d. skin rashes
e. cell-mediated immune responses
ANSWER: a
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What benefit do legumes derive from Rhizobium?
a. help make carbon dioxide more available b. increase root surface area c. nitrogen fixation d. protection e. retain water so it is more available to the plant
Positive correlations have been found between ________
A) telomere lengths and longevity among individuals within populations B) telomere lengths and longevity across many species of mammals C) telomere lengths and longevity among individuals within populations and across many species of mammals D) neither telomere lengths and longevity among individuals within populations nor telomere lengths and longevity across many species of mammals
Which word best describes the thalamus?
A) processor B) reflexor C) regulator D) transmitter
Which of the following statements describes the function of a chloroplast?
a. It stores water. b. It aids in intracellular digestion. c. It converts light energy into chemical energy. d. It manufactures proteins. e. It converts chemical energy into heat energy.