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Railway RRB Group D Science Notes – Components of a Cell

Railway RRB Group D Science Notes

Railway RRB B Exam for the Group D Posts is scheduled to begin from 17th Sept 2018. These leaves just 10 days for all the aspirants to complete their preparations for the Exam. To add to your preparation we have created this Railway RRB Group D Science Notes blog about Components of a Cell. Questions related to this topics are asked in the general awareness section of the RRB Group D Exam. The information provided in this Railway RRB Group D Science Notes blog would prove very helpful for you to answer such questions.

Railway RRB Group D Science Notes – Cell and its Components

Parts of a Cell

Properties

PROTOPLASM It is the living substance of the cell. It is a vicious, colourless fluid and is the seat for all physiological functions.
ENDOPLASMIC RETICULUM The endoplasmic reticulum is a network of membranes found throughout the cell and connected to the nucleus.
The membranes are slightly different from cell to cell and a cell’s function determines the size and structure of the ER.
RIBOSOMES They are the smallest organelles of the cell.
Ribosomes are the site of protein synthesis in the cell.
GOLGI COMPLEX Also Known as  DICTYOSOMES.
The main function of the Golgi complex is cell secretion. it packs and transports certain materials like proteins and polysaccharides out of the cells.
It is involved in the formation of primary lysosomes.
MITOCHONDRIA Mitochondrion is called ‘powerhouse of the cell’.
PLASTIDS There are 3 types of plastids – Leucoplast, Chromoplast and Chloroplast.
Leucoplasts are colourless plastids, found in the underground parts of plants which are not exposed to light.
1) Leucoplasts are colourless plastids, found in the underground parts of plants which are not exposed to light.
2) Chromoplasts are orange, yellow or red coloured plastids found in petals, fruits and roots in certain higher plants. The red colour of ripe tomatoes is the result of Chromoplasts which contain the red pigment lycopene
3) Chloroplasts are the most important and most common plastids found in all the photosynthesising cells except prokaryotes. Blue-green algae, however, lacks chloroplasts are orange, yellow or red coloured plastids found in petals, fruits and roots in certain higher plants. The red colour of ripe tomatoes is the result of Chromoplasts which contain the red pigment lycopene
Chloroplasts are the most important and most common plastids found in all the photosynthesising cells except prokaryotes. Blue-green algae, however, lacks chloroplasts
LYSOSOMES  They are called the suicidal bags as when these are injured by a toxic substance, the enzymes thus released can digest the whole cell.

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That is to the end of this Railway RRB Group D Science notes blog about Components of a Cell. We hope you liked reading this blog. Keep checking this page for more blogs on Railway RRB Group D Science notes. All the best for the RRB Group D Exam.

Railway RRB Group D Science Notes


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