Actin filaments are stabilized by
a. cofilin.
b. gelsolin.
c. thymosin.
d. tropomyosin.
e. fimbrin.
Ans: d. tropomyosin.
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Which isolating mechanism is postzygotic?
A. hybrid sterility B. behavioral isolation C. ecological isolation D. mechanical isolation E. temporal isolation
One of the characteristics of chordates is the presence of pharyngeal slits. What was the function of this structure early in chordate history?
A. respiratory surface (gills) B. jaw support C. feeding D. part of the jaw
At rest, a nerve cell has a high concentration of ____ inside and a high concentration of ____ outside
a. acetylcholine; chlorine b. sodium; potassium c. potassium; sodium d. calcium; phosphorus e. phosphorus; calcium
When the blood becomes acidic, the kidneys ____
a. produce extra bicarbonate b. reabsorb H+
c. secrete carbon dioxide d. produce water e. remove blood buffers