Which nitrogenous waste requires hardly any water for its excretion?
A) amino acids
B) urea
C) uric acid
D) ammonia
E) nitrogen gas
Answer: C
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Which of the following is true of the structure of typical transcriptional activators?
A. They contain only one type of motif. B. The regulatory domain contains the DNA-binding motif. C. The DNA-binding domain always binds to the coactivator. D. They contain a regulatory domain that can be functional when separated from the DNA-binding domain.
The Intergovernmental Panel on Climate Change reported in 2007 that atmospheric carbon dioxide levels will nearly double by the end of this century. If this happens, what will be the atmospheric concentration of carbon dioxide?
A. 2.0 ppm B. 3.5 ppm C. 385 ppm D. 560 ppm E. 700 ppm
What term is used to state that populations change over time?
What will be an ideal response?
Answer the following questions true (T) or false (F)
1. Integral proteins always extend completely through the plasma membrane. 2. The chief component of the plasma membrane is the phospholipid bilayer. 3. The glycocalyx is found just inside the plasma membrane of the cell.