Which of the following best explains the mechanism by which chromosomes in a euk

Question

Which of the following best explains the mechanism by which chromosomes in a eukaryotic cell are replicated only once per cell cycle?

A. The cell phosphorylates proteins required to prepare an origin of replication to initiate DNA replication. (I think it is A, but not sure...)

B. The cell controls the concentration of nucleotides available for DNA synthesis.

C. The cell allows DNA to be replicated only if it lacks damage.

D. The cell controls synthesis of machinery required to make more proteins.

E. The cell synthesizes CKI's that block cyclin/CDK activity after initiation of DNA replication.

What happens if a cell is unable to destroy M-cyclin at the end of a cell cycle?

A. The cell will be unable to enter mitosis. (This is wrong...)

B. The cell will be unable to complete mitosis. (50/50 on this one)

C. The cell will complete mitosis early. (nope)

D. The cell will fail to disassemble its nuclear membrane. (i dont think so)

E. The cell will complete mitosis but will not be able to activate G1 cyclins during the following cell cycle. ( I think it will be E...)

Explanation / Answer

Which of the following best explains the mechanism by which chromosomes in a eukaryotic cell are replicated only once per cell cycle?
Correct option:

What happens if a cell is unable to destroy M-cyclin at the end of a cell cycle?

Correct option:

Explanation: M cyclin promotes the breakdown of nuclear membrane and chromosome condensation. If M cyclin is not destroyed before completion of the cell cycle mitosis will not be completed as no proper nucleolus will be formed.

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