Question

Nucleus is the most vital part of a cell. Explain this statement?

Answer 1

Hint: The nucleus is the most vital organelle within the cell. It contains the genetic material, the DNA, which is liable for controlling and directing all the activities of the cell. All the RNAs needed for the cell are synthesised within the nucleus.

Complete answer:
Nucleus is named the 'Brain of the cell' because it is the foremost important due to the subsequent reasons.
(A) Contains genetic material, the DNA.
(B) It coordinates or directs the cell's activities which include growth, intermediary metabolism, protein synthesis and reproduction.
1. The nucleus is the most vital organelle within the cell.
It contains the genetic material, the DNA, which is liable for controlling and directing all the activities of the cell. All the RNAs needed for the cell are synthesised within the nucleus. The nucleolus within the nucleus is the site for RNA synthesis also as DNA replication.
The ribosomes which are the protein synthesizing machineries of the cell, are made and assembled by the nucleus, in their nucleolus. The ribosomes then enter the cytosol where they either remain free or attach themselves to the Endoplasmic Reticulum and synthesise proteins by translating mRNA.
2. Cell wall: Plant cell is surrounded by a non-living and rigid coat called cell membrane. The most function of the cell membrane is to provide plant cells a particular shape and mechanical support and strength to tissues and organs.

Note:
The genetic material, DNA is transcribed into pre‐messenger RNA (pre‐mRNAs) inside the nucleus. Further intron splicing of the pre‐mRNA takes place consistent with a particular and sophisticated arrangement of proteins and ribonuclear particles. The mature mRNA is exported to the cytoplasm for translation.