Two sea urchin proteins were named cyclin A and B because, during the embryonic cell cycle, they were periodically
a. activated and inactivated by phosphorylation and dephosphorylation.
b. synthesized and degraded.
c. bound and released by another protein.
d. ubiquitylated and non-ubiquitylated.
Ans: b. synthesized and degraded.
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Fill in the blank(s) with the appropriate word(s).