WHAT IS THE PRINCIPLES OF CELL THEORY?

CELL THEORY


principles of cell theory

 

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WHAT IS GOLGI APPARATUS IN DETAILED???

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★★★ GOLGI APPARATUS ★★★ ➤ DISCOVERED BY; ★ GOLGI APPARATUS WAS DISCOVERED BY  AN ITALIAN PHYSICIAN  CAMILLO GOLGI IN 1898.   ➤ GOLGI COMPLEX OR GOLGI APPARATUS; ★ THIS APPARATUS, WHICH WAS FOUND VIRTUALLY IN ALL EUKARYOTIC    CELLS, CONSISTS OF STACKS OF FLATTENED,  MEMBRANE BOUND SACS,     CALLED CISTERNAE . THIS CISTERNAE TOGETHER WITH ASSOCIATED    VESICLES ARE CALLED GOLGI COMPLEX .  ➤ COMPLEX SYSTEM; ★ IT IS A COMPLEX SYSTEM OF INTERCONNECTED TUBULES AROUND THE  CENTRAL STACKS. CISTERNAE STACKS ARE CONTINUOUSLY FORMED BY  FUSION OF VESICLES, WHICH ARE PROBABLY DERIVED BY THE BUDDING  OF SER.   ➤ FORMING FACE; ★ THEIR OUTER CONVEX SURFACE IS THE FORMING FACE,  ➤ MATURING FACE; ★ WHILE THE INNER CONCAVE SURFACE IS THE MATURING FACE. ➤ MOVEMENT OF CISTERNAE;   ★ THE CISTERNAE BREAK UP INTO VESICLES FROM THE LATTER.      THE WHOLE STACK CONSISTS OF A NUMBER OF CISTERNAE  ...
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PROKARYOTIC ORGANISMS

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  PROKARYOTES ➤ DEFINITION ; ★ PROKARYOTIC CELLS HAVE NO PROMINENT NUCLEUS  AND MEMBRANE    BOUND ORGANELLES  .  ➤ DERIVED FROM; ★ IT IS DERIVED FROM GREEK WORD PRO MEANS   "BEFORE"   AND KARYON    MEANS "NUCLEUS" . ➤ GENETIC MATERIAL; ★ IN PROKARYOTIC CELLS THE GENETIC MATERIAL (DNA) IS WITHOUT ANY    NUCLEAR MEMBRANE COVERING AND IS DIRECTLY SUBMERGED IN THE   CYTOPLASM. ➤ PROKARYOTES; ★ ORGANISMS POSSESSING PROKARYOTIC CELLS CALLED PROKARYOTES. ➤ DIVISION OF CELLS; ★ IN PROKARYOTES MITOSES IS MISSING AND CELL DIVIDES BY BINARY     FISSION. ➤ RIBOSOMES; ★ PROKARYOTIC CELLS HAVE SMALL SIZED RIBOSOMES "SEDIMENTS AT   70S" . ➤ DISTINCTIVE FEATURE OF PROKARYOTES; ★ PERHAPS THE MOST DISTINCTIVE FEATURE OF THE PROKARYOTIC CELL IS    ITS "CELL WALL"  ,COMPOSED OF POLYSACCHARIDE CHAINS BOUND BY    COVALENTLY TO SHORTER CHAINS OF AMINO ACIDS FORMING  ...
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