The main regulator of the calcium level in the blood is
a. parathyroid hormone.
b. thyroid hormone.
c. thymosin.
d. growth hormone.
e. insulin.
A
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Homologues of the Nascent-chain-associated chaperone (NAC) protein folding system are found in bacteria, eukaryotes, and archaea.
Answer the following statement true (T) or false (F)
Cell density in a chemostat is controlled by
A) the concentration of the limiting nutrient. B) the dilution factor. C) the size of the initial inoculum. D) the concentration of the limiting nutrient, the dilution factor, and the size of the initial inoculum.
Who developed the modern endosymbiotic theory?
a. Charles Darwin b. Lynn Margulis c. Richard Dickerson d. Wendy Johnson e. Stanley Miller
The term "reducing atmosphere" for the early Earth means that the atmosphere
A. contained little or no carbon dioxide. B. contained little or no free nitrogen. C. was much thinner around the surface of the Earth than now. D. contained only two or three kinds of gases. E. contained little or no free oxygen.