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L4 - Nucleus : Structure & Function - The Fundamental Unit of Life, Class 9, Science Video Lecture

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FAQs on L4 - Nucleus : Structure & Function - The Fundamental Unit of Life, Class 9, Science Video Lecture

1. What is the structure of the nucleus?
Ans. The nucleus is a membrane-bound organelle present in eukaryotic cells. It is typically spherical and contains genetic material in the form of DNA. It is surrounded by a double-layered nuclear envelope, which has nuclear pores for the exchange of materials between the nucleus and the cytoplasm.
2. What is the function of the nucleus?
Ans. The nucleus serves as the control center of the cell and is responsible for various functions. Its main function is to store and protect the genetic information of the cell in the form of DNA. It also plays a crucial role in gene expression, DNA replication, and cell division.
3. How does the nucleus control the cell?
Ans. The nucleus controls the cell by regulating the synthesis of proteins through gene expression. It contains the DNA, which carries the instructions for protein synthesis. These instructions are transcribed into mRNA, which is then transported to the cytoplasm for protein synthesis. The nucleus also regulates cell division and growth.
4. What are nuclear pores and their significance?
Ans. Nuclear pores are small openings present in the nuclear envelope. They act as gateways, allowing the exchange of materials between the nucleus and the cytoplasm. Small molecules, ions, and proteins can freely pass through these pores, while larger molecules require specific transport mechanisms. This exchange is crucial for the proper functioning of the cell.
5. How does the structure of the nucleus relate to its function?
Ans. The structure of the nucleus, including its membrane-bound nature and the presence of nuclear pores, is directly related to its function. The nuclear envelope separates the genetic material from the cytoplasm, protecting it from potential damage. The nuclear pores allow the necessary exchange of molecules, enabling gene expression and proper cellular processes. Without these structural features, the nucleus would not be able to carry out its essential functions.
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