If media A is pH 9 and media B is pH 7, then the media at pH 9 is _________________ times more alkaline than the pH 7 media.
A) 100
B) 1000
C) 10
D) 20
E) 2
A) 100
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Which of the following is the most common type of hydrolysis damage in the cell?
A. deamination of thymidine B. breakage of the glycosidic linkage between the pyrimidines and the DNA backbone C. removal of cytosine from the DNA backbone to create an abasic site D. deamination of cytosine to uracil E. None of the damage types given is known to occur in cells.
Biosynthetic reactions that require energy for the conversion of molecular subunits into larger molecules are called
A. kinetic energy. B. catabolic reactions. C. precursor molecules. D. anabolic reactions.
The purpose of the sex pilus is to:
a. form a cytoplasmic bridge and conjugate. b. form a gap junction and conjugate. c. facilitate cytoplasmic exchange. d. allow bacteriophage infection. e. lyse the cell.
The loss of ________ that occurs at each trophic level places a limit on how many top-level carnivores a community can support.
A. CO2 B. water C. light D. O2 E. energy