IX A Science Chapter -5 Fundamental unit of life ( Summary of the topic taught as on 16/06/21)

Grade IX A
Subject Science
Topic- Fundamental unit of life
Date 16/6/21

Revision of concepts
Chromatin material:
The chromatin is a thin, thread-like intermingled mass of chromosome material and composed of the genetic substance DNA (deoxyribonucleic acid) and proteins (i.e., histones).
 DNA stores all the information necessary for the cell to function (metabolism), to grow and to reproduce further cells of the next generation.
The chromatin is condensed into two or more thick ribbon-like chromosomes during the division of cell.
Functional segments of DNA are called genes.
Genes carry information for protein synthesis, which in turn control the development of characters. Since genes are present on chromosomes and chromosomes pass from one generation to the next through, genes are called hereditary units.
Functions of nucleus:
The nucleus controls all metabolic activities of the cell. If the nucleus is removed from the cell, the protoplasm ultimately dries up and dies.
It regulates the cell cycle.
It is the storehouse of genes which are concerned with the development and manifestation of all the body characters.
Nucleus helps in the formation of ribosomes and RNA.
It helps in the transmission of characters from one generation to the next.

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