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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology