Trimming a shrub will make it become more bushy (have more lateral growth) primarily due to a
reduction in the amount of ____.
a. auxin
b. ethylene
c. abscisic acid
d. gibberellin
e. cytokinin
A
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What is the purpose of the intestinal villi and microvilli?
a. increase surface for maximum absorption b. increase surface area for maximum infiltration of capillary beds c. decrease area for bacterial growth d. increase area for bacterial growth e. increase the area for the serosa
The overall exchange of oxygen inhaled from the air for waste carbon dioxide is
a. respiration. b. perfusion. c. percolation. d. saponification. e. expulsion.
What is the immediate result once a signal molecule binds to a receptor protein-tyrosine kinase?
a. receptor dimerization b. receptor trimerization c. receptor denaturation d. receptor polymerization e. receptor hydrolysis
Which of the following are components of a phospholipid?
a. a molecule of glycerol b. a phosphate molecule c. two fatty acid chains d. all of the above