Which of the following events occurs in mitotic metaphase?
A) Nuclear envelope breakdown B) Nuclear envelope reassembly C) Chromosome attachment to spindle microtubules for the first time D) Chromosome alignment at the spindle equator E) Mitotic spindle assembly
Consider two mammalian cells, one in G₁ and the other in G₀ (stationary) phase. If they are stimulated to pass the restriction point by the addition of an extracellular proliferation signal, but the signal is then immediately removed, what would you expect to happen?
A) Both cells will replicate their DNA. B) Only the G₁ cell will replicate its DNA. C) Only the G₀ cell will replicate its DNA. D) Only the G₁ cell will start to replicate its DNA, but will stop halfway through the replication and will not reach G₂. E) Neither of the cells will replicate their DNA.
How is centrosome duplication similar to DNA replication?
A) They both use a semiconservative mechanism. B) They are initiated at around the same time in the cell cycle, near the G₁/S transition. C) They are both controlled in such a way that they replicate once and only once per cell cycle. D) They are both separated from their sister copies in mitosis. E) All of the above.