Cell Cycle and Cell DivisionHard
Question
Which of one the following precedes refomation of the nuclear envelope during M-phase of the cell cycle ?
Options
A.Decondrnsatiov from chomosomes and reassembly of the nuclear lamina
B.Transcription from chromosomes and reassembly of the nuclear lamina
C.Formation of the contractile ring and formation of the phragmoplast
D.Formation of the contractile ring and transcription from chromosomes
Solution
At telophase stage, nuclear membrane vesicles associate with the surface of individual chomosomes and fuse to reform the nuclear membraes, which partiall enclose clusters of chomosomes beform coalescing to reform the complete nuclear envelope. During this process the nuclear pores reassemble and the dephosphorylated reassociate to form the nuclear lamains. One of the lamina proteins (lamina-B) remains with the nuclear membranc fragments throughout mitosis and may help nuclear reassembly. After the nucleus reforms, the pores pump in nuclear proteins, the chomosome decondense and RNA synthesis resumes, causing the nucleolus to reappesar.
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