what is structure and function of nuclueus cell
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Answer:
The nucleus is a membrane bound organelle found in the majority of eukaryotic cells. It is the largest organelle of the eukaryotic cell, accounting for around 10% of its volume. It houses the genome, and through gene expression, it co-ordinates the activities of the cell.
In this article, we will consider the structure and function of the nucleus.
Structure
The nucleus is a relatively large and spherical membrane-bound organelle. The nucleus itself is comprised of distinct components, and understanding their structure allows a deeper understanding of their function.
Nuclear envelope
The nucleus is completely surrounded by the nuclear envelope. This consists of both an inner and outer membrane which run parallel to each other. The envelope is perforated by small gaps known as the nuclear pores. These pores are around 100nm wide in true diameter, however due to the presence of central regulatory proteins the true size of the gap is around 9nm.
This small size controls the passage of molecules into and out of the nucleus. Larger molecules such as larger proteins and nucleic acid are unable to pass through these pores, and so the function of the nuclear envelope is to selectively separate the contents of the nucleus from that of the cytoplasm.
The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle. The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material