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Q30. During passage through the G1/S transition, the phosphatase that removes the Tyr15 phosphate from CDK becomes phosphorylated by the CDK/cyclin. What is the effect of this phosphorylation event?

Q30. During passage through the G1/S transition, the phosphatase that removes the Tyr15 phosphate from CDK becomes phosphorylated by the CDK/cyclin. What is the effect of this phosphorylation event?

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Q30. During passage through the G1/S transition, the phosphatase that removes the Tyr15 phosphate from CDK becomes phosphorylated by the CDK/cyclin. What is the effect of this phosphorylation event? O It inhibits the phosphatase activity as part of the negative feedback loop of CDK/cyclin activation. It inhibits the phosphatase activity as part of the positive feedback loop of CDK/cyclin activation. It activates the phosphatase activity as part of the positive feedback loop of CDK/cyclin activation. It activates the phosphatase activity as part of the negative feedback loop of CDK/cyclin activation.
Transcribed Image Text:Q30. During passage through the G1/S transition, the phosphatase that removes the Tyr15 phosphate from CDK becomes phosphorylated by the CDK/cyclin. What is the effect of this phosphorylation event? O It inhibits the phosphatase activity as part of the negative feedback loop of CDK/cyclin activation. It inhibits the phosphatase activity as part of the positive feedback loop of CDK/cyclin activation. It activates the phosphatase activity as part of the positive feedback loop of CDK/cyclin activation. It activates the phosphatase activity as part of the negative feedback loop of CDK/cyclin activation.
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