In the cells of many eukaryotic species, the nuclear envelope has to disappear to permit which of the following events in the cell cycle?
A) DNA synthesis
B) attachment of microtubules to kinetochores
C) separation of the centrosomes
D) condensation of the chromosomes

Question

Quizplus · Accepted Answer

The attachment of microtubules to kinetochores is required for the proper alignment and separation of chromosomes during mitosis. The nuclear envelope must break down to allow the microtubules to access the chromosomes and attach to the kinetochores. Therefore, the disappearance of the nuclear envelope is necessary for the proper progression of mitosis. DNA synthesis, centrosome separation, and chromosome condensation can occur with the nuclear envelope intact.

In the Cells of Many Eukaryotic Species, the Nuclear Envelope