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Pleomorphism of Lysosomes

  Pleomorphism of Lysosomes Lysosomes show pleomorphism, which means they occur in many different forms according to their functional state. They are not always identical in shape, size, or contents. Their appearance changes depending on whether they are newly formed, involved in digestion, or storing undigested waste materials.  Lysosomes are membrane-bound organelles containing hydrolytic enzymes. These enzymes digest proteins, lipids, carbohydrates, nucleic acids, and other cellular materials. Since lysosomes perform different digestive functions inside the cell, they appear in different structural forms. This property is called pleomorphism.  The main pleomorphic forms of lysosomes are primary lysosomes, secondary lysosomes, autophagic vacuoles, and residual bodies. Primary lysosomes are newly formed lysosomes produced by the Golgi apparatus. They contain inactive hydrolytic enzymes and have not yet taken part in digestion. They are small, spherical vesicles surround...

Nucleus: Chemical constituents

  Chemical constituents of Nucleus Nucleus is called apparatus of heredity. It is the largest extractoplasmic component of cell which contains all the genetic information to control morphology, function and heredity. It is called control room / director/heart of cell. A nucleus in metabolic phase (nondividing phase) I phase is called interphase nucleus. It is not an organelle of cell but component of protoplasm or called extractoplasmic organelle . Nucleus has DNA 9-12 % , RNA 5 % , Lipids 3 % and Ca , Mg , Mn , Na , P , Fe and K , 80 % proteins (65 % acidic non-histone which have height mol. wt., rich in tyrosine and tryptophan, forms enzymes, and helps in transciption of dNA to form RNA ; 15 % proteins are basic like, histone proteins of low mol. wt ., rich in lysine and arginine), DNA : histone ratio is roughly 1 : 1 . Histones neutralize acidity of nucleic acid and prevent transcription of dNA . Histones are structural proteins and suppress genes . Non- histones are functional ...

Wild Mushroom collected from Gorubathan

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