Structure Of Cell Essay
Structure of Cell
Cell is generally composed of three basic components:
(i) Cell wall and cell membrane
(ii) Nucleus
(iii) Cytoplasm
(i) Cell membrane or Plasma membrane:
Plasma membrane is the covering of the cell that separates the contents of the cell from its external environment.
It is a living part of the cell and is present in cells of plants, animals and microorganisms.
It is very thin, delicate, elastic and selectively permeable membrane.
It is very thin, delicate, elastic and selectively permeable membrane.
It is very thin, delicate, elastic and selectively permeable membrane.
It is very thin, delicate, elastic and selectively permeable membrane.
It is very thin, delicate, elastic and selectively permeable membrane.
It is
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Function:
They play a major role in the synthesis of proteins.
4. Mitochondria:
They are small rod-shaped organelles.
It is a double membrane structure with outer membrane being smooth and porous whereas inner membrane being thrown into a number of folds called cristae.
They contain their own DNA and ribosomes.
They are absent in bacteria and red blood cells of mammals.
Functions:
• They are the sites of cellular respiration, hence provide energy for the vital activities of living cells.
• They store energy releases during reactions, in the form of ATP (Energy currency of the cell). Therefore, they are also called ‘power house’ of the cell.
5. Plastids:
Plastids are present in most of the plant cells and absent in animal cells.
They are usually spherical or discoidal in shaped and double membrane bound organelles.
They also have their own DNA and ribosomes.
Plastids are of three types:
(a) Chloroplasts: These are the green coloured plastids containing chlorophyll. Chloroplasts aid in the manufacture food by the process of photosynthesis.
(b) Chromoplasts: These are the colourful plastids (except green colour).
(c) Leucoplasts: These are the colourless
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