The Question is from neet-botany cell-cycle-and-cell-division , and it was created by the author NISHANTH

Question

Which one of the following precedes re-formation of the nuclear envelope during M-phase of the cell cycle?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
**Primary Concept**:  The order of events during M-phase (mitosis) of the cell cycle.
**Related Topics**: Nuclear envelope breakdown and reformation, chromosome condensation and decondensation, cytokinesis.
**Prerequisites**: Basic knowledge of the cell cycle, mitosis, and the structures involved.
## SOLUTION PATHWAY
**Given Information**:
 The question asks about the event that *precedes* nuclear envelope reformation during M-phase.
**Method & Steps**:
1.  Identify the key events of M-phase that are relevant to nuclear envelope reformation. These include chromosome condensation/decondensation, nuclear lamina dynamics, and cytokinesis.
    Reasoning:  Nuclear envelope reformation is a late event in M-phase, occurring after chromosome segregation.
2. Analyze each option:
    * Option A: Decondensation of chromosomes and reassembly of the nuclear lamina are both necessary for nuclear envelope reformation.
    * Option B: Transcription is largely suppressed during mitosis, and it is not required for nuclear envelope reassembly, thus incorrect.
    * Option C: Formation of the contractile ring and phragmoplast are related to cytokinesis, which occurs after nuclear envelope reformation, thus incorrect.
    * Option D: Similar to C, contractile ring and transcription is suppressed during mitosis, thus incorrect.
3. Determine the correct sequence. Decondensation of chromosomes and reassembly of the nuclear lamina must occur before the nuclear envelope can re-form.
    Result: Option A is the correct answer.
## OPTION ANALYSIS
[A] ✓: Decondensation of chromosomes and reassembly of the nuclear lamina are essential steps that need to happen before the nuclear envelope can reform. The nuclear lamina provides structural support to the nuclear envelope.
[B] :x: Transcription is not a prerequisite for the reformation of the nuclear envelope. In fact, transcription is largely shut down during mitosis. 
[C] :x: The formation of the contractile ring and phragmoplast are events associated with cytokinesis, which happens after the nuclear envelope is reformed.
[D] :x: Similar to C, contractile ring is part of cytokinesis. Transcription is not a prerequisite for nuclear envelope reformation.
## LEARNING AIDS
**Common Mistakes**:
1. Confusing the order of events in mitosis: Review the stages and sequence of events in mitosis. 
2.  Misunderstanding the function of the nuclear lamina: Understand that the nuclear lamina provides structural integrity to the nuclear envelope and needs to be reassembled for nuclear envelope reformation.
**Quick Tips**:
1. Remember the sequence: chromosome segregation -> decondensation -> nuclear lamina reassembly -> nuclear envelope reformation -> cytokinesis.
2. Visualize the processes: Draw a simple diagram of the cell cycle and the events of mitosis to help solidify understanding.

NISHANTH · Answer

The correct Option is "Decondensation from chromosome and reassembly of the nuclear lamina"

NISHANTH · Answer

Transcription from chromosomes and reassembly of the nuclear lamina

NISHANTH · Answer

Formation of the contractile ring and formation of the phragmoplast

NISHANTH · Answer

Formation of the contractile ring and transcription from chromosomes

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