Tiêu đề Notes_Fundamental Unit of Life_Fundamental Unit of Life.pdf ✅

www.thinkiit.in Page 3 thinkIIT  Cells may be diverse shapes such as polyhedral (8, 12 or 14 sides) spherical (e.g. eggs of mainly animals), spindle shaped (Smooth muscle fibres), elongated (e.g. Nerves cells) so on.  Cell Size :  The size of different cells ranges between broad limits.  Some plants and animals cells are visible to the naked eye.  Most cells are visible only with microscope.  The prokaryotic cells usually range between 1 to 10 m.  The eukaryotic cells usually range between 10 to 100 m.  Amoeba proteus may reach a diameter of 0.5 mm.  The smallest cells are those of Mycoplasma laidlawiil (0.1μ in diameter) or PPLO (pleura pneumonia like organism).  The largest cell is egg of an Ostrich.  Cell Number :  The number of cell in living organisms also varies greatly.  In unicellular organisms, a single cell occur its body eg. Chlamydomonas, Chlorella, Amoeba.  In human body, the estimated number of cell is 100 trillion (1014) (B) Component of cell :  Major components are - A living part of cell Non living part of cell a. Plasma membrane a. Cell wall b. Cytoplasm b. Vacuoles (i) E.R. c. Cell inclusions (ii) Mitochondria (iii) Golgi apparatus (iv) Ribosomes (v) Lysosomes Centrioles Cell membrance Ribosomes E. R. Nucleus Mitochondrion Nucleolus Small vacuole Golgi complex Plant vacuole Starch grain Cell wall Chloroplast Animal Cell Plant Cell STRUCTURE OF CELL Tonoplast