ex… Show more Based on your understanding of the regulation of the eukaryotic cell cycle how could you explain each of the following experimental observations? (a) When MPF is injected into cells that have just emerged from S phase, chromosome condensation and nuclear envelope breakdown occur immediately, rather than after the normal G2 delay of several hours. (b) When an abnormal, indestructible form of mitotic cyclin is introduced into cells, they enter mitosis but cannot emerge from it (c) Mutations that inactivate the main protein phosphatase used to catalyze protein dephosphorylations cause a long delay in the reconstruction of the nuclear envelope that normally takes place at the end of mitosis. • Show less