Which organisms may be a keystone species in a tropical rain forest?
a. gray wolves
b. fruit-eating bats
c. poison arrow frogs
d. fig trees
e. fruit-eating monkeys
d
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The ________ and ________ domains of the class II MHC protein interact to form a peptide-binding site
A) B / T B) light / heavy C) C / V D) ?1 / ?1
Which of the following is not a correct pairing of structure and function?
A. circular muscle layer: contraction increases the diameter of the lumen B. longitudinal muscle layer: contraction shortens small sections of the gut C. serosa: protection of the gut D. mesentery: supports the gut in the abdominal cavity E. mucosa: secretes mucus
Which of the following infections does not affect a structure in the respiratory tract?
A. laryngitis B. strep throat C. otitis media D. bronchitis E. tonsillitis
Using microbes to break down or remove toxic wastes in water and soil is called
A. synergism. B. recycling. C. mineralization. D. bioremediation. E. decomposition.