ADH affects the process of ____
a. filtration
b. secretion
c. reabsorption
d. excretion
e. elimination
ANSWER: c
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When nutrients are suboptimal for cell growth and division, the cell cycle arrests. At which stage of the cell cycle/checkpoint would you predict this arrest to occur?
A. G1 checkpoint B. G2 checkpoint C. M checkpoint D. G1, G2, and the M checkpoints E. It is not possible to answer with the information given.
The molecule produced by the daf-2 gene is likely a(n) __________
a. amino acid b. nucleotide c. protein d. lipid
Which characteristic applies to tropical rain forests?
a. Little sunlight reaches the forest floor. b. Diversity is limited because the tall forest canopy shuts out most of the incoming light. c. Conditions are extremely favorable for growing luxuriant food crops. d. Competition for resources is extremely low. e. Temperatures vary greatly.
Nitrogen (N) normally forms three covalent bonds with a valence of 5. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of 1). What do you predict to be the charge on ammonium?
A) +1 B) -1 C) +2 D) -2