You engineer yeast cells that express the M cyclin during S phase by replacing the promoter sequence of the M cyclin gene with that of S cyclin
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 cyclins will be expressed during S phase.
(d) S-Cdk targets will be phosphorylated during S phase.
(c) The transcription of the G1 cyclins should not be affected by S-Cdk (which normally occurs in S phase) or M-Cdk (which likely now exists within the cell due to the inappropriate expression of M cyclin from the S cyclin promoter).
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A. Phe B. Ser C. Tyr D. Thr E. All of the amino acids given are phosphorylated.
An endosperm develops when the
a. pollen grain begins to form. b. pollen grain sticks to a stigma. c. sperm fertilizes the central cell. d. sperm fertilizes an egg
Briefly describe the places where tRNA would be found in a ribosome
What will be an ideal response?
Which of the following involves one gene suppressing the expression of another gene?
a. Epistasis b. Recombination c. Linkage d. Incomplete dominance