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Nucleus essay


nucleus essay

origin of the cell nucleus. Chromosomes undergo a regular cycle of condensation and decondensation during the cell division. Here is a list of the important functions carried out by a cell nucleus. (i) Amorphous Matrix: It is the homogeneous ground substance of the nucleolus. Each half is known as a chromatid. It is granular in nature. The regions flanking the centromere frequently contain highly repetitive DNA and stain intensely with basic dyes. During the resting stage (interphase) of the cell, the chromosomes are uncoiled into a mass of loose thread-like, light staining stiuctures called chromatin the nucleolus is produced from and is associated with a specific nucleolar organising region on a chromnosome. Nuclear pores have complex structure. Presence of hereditary information in the nucleus was proved by the work of Joachim Hammerling (1953) on single celled alga Acetabularia (Fig.

Nucleus essay
nucleus essay

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The same are synthesised in the cytoplasm (over the ribosomes) and transferred to nucleolus, (iv) It is essential for spindle formation during nuclear division. They appear oval or elliptical in plant cells having large central vacuoles. Commonly it is situated in the geometric centre of the cell. The outer layer of the membrane is connected to the endoplasmic reticulum. Traces of minerals like Calcium, Magnesium, Potassium and Sodium (Phosphorus is a constituent of DNA, RNA and acid proteins). Essay on the Number of Nucleus. Up to 1600 nucleoli are reported in the oocytes of Xenopus. In telocentric type, the centromere is located at one end, such that there is only one arm. The nuclear envelope is not just a physical barrier, but it regulates the passage of ions, small molecules and RNA.

Advertisements: Multinucleate or polynucleate condition is found in some cells of bone marrow, striated muscles, latex vessels, several fungi and algae. According to folded fibre model, the chromosome is considered to be a single chromatin fibre that is repeatedly folded back on it to make up the body of the chromosome. W.Fleming described the splitting of chromosomes and termed the stained material as chromatin.

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