For a cell to progress through each phase of the cell cycle:
Question 8 options:
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a. it must have only Cdk's (cyclin dependent kinases) present.
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b. it must have only cyclin proteins present.
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c. it must have all four cyclin proteins (cyclin A, B, D, and E) present at the same time.
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d. it must have a cyclin and Cdk that can form a complex that will phosphorylate other protein targets.
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e. the cell cycle is not regulated.
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