CELL ALL WORD 1 The cellular organisation of all life forms 2 All organisms are composed of cells 3 Cell is the fundamental structural and functional unit of all living organisms 4 All plants are composed of different kinds of cells which form the tissues of the plant 5 All living organisms are composed of cells and products of cells 6 All cells arise from pre existing cells 7 Ribosomes are non membrane bound organelles found in all cells both eukaryotic as well as prokaryotic 8 All prokaryotes have a cell wall surrounding the cell membrane except in mycoplasma 9 The eukaryotes include all the protists plants animals and fungi 10 All eukaryotic cells are not identical 11 Animal cells have centrioles which are absent in almost all plant cells 12 The isolated lysosomal vesicles have been found to be very rich in almost all types of hydrolytic enzymes optimally active at the acidic pH 13 Plastids are found in all plant cells and in euglenoides 14 All organisms are made of cells or aggregates of cells 15 All the cell organelles perform different but specific functions 16 Lysosomes are single membrane structures containing enzymes for digestion of all types of macromolecules ONLY 1 Ribosomes are found not only in the cytoplasm 2 Mycoplasmas the smallest cells are only 0 3 m in length 3 Cell wall not only gives shape to the cell and protects the cell from mechanical damage and infection 4 Normally there is only one nucleus per cell 5 Every chromosome visible only in dividing cells 6 It not only controls the activities of organelles but also plays a major role in heredity 7 Plastids are pigment containing organelles found in plant cells only SOME 1 Some are composed of a single cell and are called unicellular organisms 2 Nerve cells are some of the longest cells 3 Glycocalyx could be a loose sheath called the slime layer in some 4 In some prokaryotes like cyanobacteria there are other membranous extensions into the cytoplasm called chromatophores which contain pigment 5 In some bacteria Pili and Fimbriae are known to help attach the bacteria to rocks in streams and also to the host tissues 6 The membrane is selectively permeable to some molecules present on either side of it 7 Plastids bear some specific pigments thus imparting specific colours to the plants 8 Some mature cells even lack nucleus 9 Some basic proteins called histones 10 Some non histone proteins and also RNA