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Sample text
New and hitherto unknown polysaccharides are constantly being found as more and more plant, bacterial, and animal tissues are analysed, and many of these have highly complex patterns of constituent sugars and branching chains. But the most frequently occurring of the polysaccharides are rather Simpler in structure. There are three: 'tWo of plant origin, cellulose and starch; and one from animals, ,lycogen. on that it will be made of cellulose. Cotton, flax, wood, paper, eveD rayon lre all cellulose; the hairs of the cotton seed plant, in particular, are over ninety per cent pure cellulose.
These ions are crucial for the functioning of the cell; they maintain its correct internal environment in the absence of which the macromolecules will be unable to function or may even disintegrate, and they are essential cofactors for many of the chemical reactions of the cell, as well as being directly involved in such cell functions as nerve transmission and muscular contraction. Phosphates The phosphate ion is an atom of phosphorus combined with four atoms of oxygen and has the formula P0 4 3-.
Advanced, and complete or nearly complete sequences are now , known for 500 or so proteins in many different species, the largest being more than 500 amino acid units in length. Meanwhile, the way towards a quite different approach to protein sequencing has , been opened by increasing knowledge of the structure of DNA and RNA. We will see later how it is that DNA and RNA sequences determine proteins; for now the point is simply that one can predict a protein structure on the basis of a nucleic acid structure.
