Question

46. Which one of the following precedes re-formation
of the nuclear envelope during M phase of the cell
cycle?
(1) Decondensation from chromosomes, and
reassembly of the nuclear lamina
(2) Transcription from chromosomes, and
reassembly of the nuclear lamina
(3) Formation of the contractile ring, and formation
of the phragmoplast
(4) Formation of the contractile ring, and
transcription from chromosomes





please solve it and explain


all Friends​

Answer 1

Decondensation from chromosomes and reassembly of the nuclear lamina


Explanation :

At telophase stage, nuclear membrane vesicles associate with the surface of individual chromosomes and fuse to reform the nuclear membranes, which partially enclose clusters of chromosomes before coalescing to reform the complete nuclear envelope. During this process the nuclear pores reassemble and (the dephosphorylated reassociare to form the nuclear lamina.) One of the lamina proteins (lamina - B) remains with the nuclear membrane fragments throughout mitosis and may help nucleate ressembly. After the nucleus reforms, the pores pump in nuclear proteins, the chromosome decondense and RNA synthesis causing the nucleolus to reappear.