In order to be active, a Cdc-cyclin needs to be
A) singly phosphorylated.
B) acetylated.
C) doubly phosphorylated.
D) doubly methylated.
E) cleaved by proteases.
A) singly phosphorylated.
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Carnivores must be at or above which trophic level?
a. first b. second c. third d. fourth e. fifth
The most-favored-nation policy implies that the United States will
a. extend concessions made in bilateral trade agreements to all other nations. b. give preference to North American nations in all trade matters. c. work to lower trade barriers with Canada. d. extend tariff and quota concessions only to major trading partners.
The experiments of which of the following
researchers clearly distinguished DNA and NOT protein as the hereditary material? a. Pauling b. Hershey and Chase c. Griffith d. Watson and Crick e. Avery
Which of the following events occurs directly after a DNA molecule is unzipped?
A.) Mismatched nucleotide bases are identified and replaced. B.) Free-floating nucleotides pair up with exposed bases. C.) Identical double-stranded DNA molecules are formed. D.) Enzymes break hydrogen bonds between base pairs.