Question

Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle:

• A. Transcription from chromosomes and reassembly of the nuclear lamina
• B. Formation of the contractile ring and formation of the phragmoplast
• C. Formation of the contractile ring and transcription from chromosomes
• D. Decondensation from chromosomes and reassembly of the nuclear lamina

Answer 1

The correct option is A Transcription from chromosomes and reassembly of the nuclear lamina

Transcription from chromosomes and reassembly of the nuclear lamina is highly regulated in time followed by nuclear envelope assembly.
The M phase is the mitotic phase of the cell cycle. Mitosis and cytokinesis together define the mitotic (M) phase of an animal cell cycle.
Decondensation from chromosomes and reassembly of the nuclear lamina happen during the end of the telophase.
Formation of the contractile ring and formation of the phragmoplast (a structure specific to plant cells, that forms during late cytokinesis) are part of the M phase.