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Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle
[2004]
- a)Transcription from chromosome and reassembly of the nuclear lamina
- b)Decondensation from chromosome 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
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which one of the following precedes reformation of the nuclear envelop...
At the beginning of M phase or mitotic phase the nuclear membrane and nucleolus disappear. The decondensation of chromosomes occur. But when nuclear envelop restart forming then nuclear lamina assemble and chromosomes start condensing.
Most Upvoted Answer
Which one of the following precedes reformation of the nuclear envelop...
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 reassociate to form the nuclear lamina. One of the lamina protiens (lamina-B) remains with the nuclear membrane fragments throughout mitosis and may help nuclear reassembly.
•After the nucleus reforms, the pores pump in nuclear protiens, the chromosomes decondense and RNA synthesis resumes, causing the nucleolus to reappear.
so the ans must be option a
•During this process the nuclear pores reassemble and the dephosphorylated reassociate to form the nuclear lamina. One of the lamina protiens (lamina-B) remains with the nuclear membrane fragments throughout mitosis and may help nuclear reassembly.
•After the nucleus reforms, the pores pump in nuclear protiens, the chromosomes decondense and RNA synthesis resumes, causing the nucleolus to reappear.
so the ans must be option a
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Which one of the following precedes reformation of the nuclear envelop...
Explanation:
During M phase of the cell cycle, the nuclear envelope disassembles to allow for chromosome segregation and the formation of the mitotic spindle. After chromosome segregation, the nuclear envelope needs to be reformed to enclose the newly formed daughter nuclei. The reformation of the nuclear envelope involves several steps, and one of the key events that precedes this process is the decondensation of chromosomes and the reassembly of the nuclear lamina.
Decondensation of Chromosomes:
- During mitosis, chromosomes become highly condensed and tightly packed to facilitate their segregation.
- However, after chromosome segregation is completed, the condensed chromosomes need to be decondensed to allow for transcription and other cellular processes to resume.
- The decondensation of chromosomes involves the relaxation of the chromatin structure, leading to the unwinding of the DNA and the loosening of the packing of histones.
- This decondensation process is necessary for the reformation of the nuclear envelope.
Reassembly of the Nuclear Lamina:
- The nuclear lamina is a mesh-like network of intermediate filaments that provides structural support to the nuclear envelope.
- During M phase, the nuclear lamina is disassembled to allow for the breakdown of the nuclear envelope.
- After chromosome segregation, the nuclear lamina needs to be reassembled to reform the nuclear envelope.
- The reassembly of the nuclear lamina involves the recruitment and assembly of lamin proteins at the inner surface of the newly formed daughter nuclei.
Therefore, option B (Decondensation from chromosome and reassembly of the nuclear lamina) is the correct answer as it correctly describes the events that precede the reformation of the nuclear envelope during M phase of the cell cycle.
During M phase of the cell cycle, the nuclear envelope disassembles to allow for chromosome segregation and the formation of the mitotic spindle. After chromosome segregation, the nuclear envelope needs to be reformed to enclose the newly formed daughter nuclei. The reformation of the nuclear envelope involves several steps, and one of the key events that precedes this process is the decondensation of chromosomes and the reassembly of the nuclear lamina.
Decondensation of Chromosomes:
- During mitosis, chromosomes become highly condensed and tightly packed to facilitate their segregation.
- However, after chromosome segregation is completed, the condensed chromosomes need to be decondensed to allow for transcription and other cellular processes to resume.
- The decondensation of chromosomes involves the relaxation of the chromatin structure, leading to the unwinding of the DNA and the loosening of the packing of histones.
- This decondensation process is necessary for the reformation of the nuclear envelope.
Reassembly of the Nuclear Lamina:
- The nuclear lamina is a mesh-like network of intermediate filaments that provides structural support to the nuclear envelope.
- During M phase, the nuclear lamina is disassembled to allow for the breakdown of the nuclear envelope.
- After chromosome segregation, the nuclear lamina needs to be reassembled to reform the nuclear envelope.
- The reassembly of the nuclear lamina involves the recruitment and assembly of lamin proteins at the inner surface of the newly formed daughter nuclei.
Therefore, option B (Decondensation from chromosome and reassembly of the nuclear lamina) is the correct answer as it correctly describes the events that precede the reformation of the nuclear envelope during M phase of the cell cycle.
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Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer?
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Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer?.
Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle[2004]a)Transcription from chromosome and reassembly of the nuclear laminab)Decondensation from chromosome and reassembly of the nuclear laminac)Formation of the contractile ring, and formation of the phragmoplastd)Formation of the contractile ring, and transcription from chromosomesCorrect answer is option 'B'. Can you explain this answer?.
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