You Engineer Yeast Cells That Express the M Cyclin During

question 33

Multiple Choice

You engineer yeast cells that express the M cyclin during S phase by replacing the gene regulatory sequences of the M cyclin gene with those of the S cyclin gene.Keeping in mind that yeast cells have one common Cdk that binds to all cyclins, which of the following outcomes is LEAST likely during this experiment?

• A)There will be both M cyclin-Cdk and S cyclin-Cdk complexes in the cell during S phase.
• B)Some substrates that are normally phosphorylated in M phase will now be phosphorylated in S phase.
• C)G₁ cyclin-Cdks will be activated earlier in G1.
• D)S-Cdk targets will be phosphorylated during S phase.

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