You Engineer Yeast Cells That Express the M Cyclin During

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.