Nucleus

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by Aries2634
Last updated 7 years ago

Discipline:
Science
Subject:
Cell Biology
Grade:
9

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Nucleus

A cell nucleus is the part of the cell which contains the genetic code, the DNA, and the RNA. It also controls the activities in a cell. The nucleus is small and round, and it works as the cell's control center. It contains chromosomes, and inside the chromosomes are DNA strands. The human body contains billions of cells, which vary from blood cells that carry oxygen from one part of the body to another, nerve cells which create reactions that stimulate feelings and data, and skin cells that protect the cells underneath.Cell nuclei are only found in eukaryotes. They were first found by Antonie van Leeuwenhoek in the 17th century. Bacteria and Archaea are single-celled organisms of quite a different type: they are prokaryotes, and their cells do not have nuclei, or membrane bound organelle.

Nucleus

The Brain Of the CellBy Gayathri Panikar

Details...Right here!

It consists of :-

Structure

1) The nucleolus (plural nucleoli) is a non-membrane bound structure found in the nucleus of cells. It is composed of proteins and nucleic acids found within the nucleus of eukaryotic cells. Its function is to transcribe ribosomal RNA (rRNA) and assemble it within the cell.2)The nuclear membrane, also known as the nuclear envelope, is the double lipid bilayer membrane which surrounds the genetic material and nucleolus in eukaryotic cells.Nuclear pores are large protein complexes that cross the nuclear envelope.3)The nucleoplasm is a highly viscous liquid that surrounds the chromosomes and nucleoli. Many substances such as nucleotides (necessary for purposes such as the replication of DNA) and enzymes (which direct activities that take place in the nucleus) are dissolved in the nucleoplasm.

Chromosomes

Nucleus


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