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Biomolecules are classified into biomicromolecules and biomacromolecules., , BIOMICROMOLECULES, ¢ Chemical compounds which have a molecular weight less than 1000 dalton are called, biomicromolecules., ¢ They are seen in the acid soluble fraction obtained during chemical analysis. They, include inorganic constituents., BIOMACROMOLECULES, ¢ The biomolecules which are insoluble in acids and have very high molecular weight, are called biomacromolecules., ¢ They have molecular weight above 10,000 dalton except lipids., ¢ Eg; Proteins, nucleic acids, polysaccharides, lipids., The Molecular Weight of Lipids are Below 800 Dalton _but_it is included_in, Biomacromolecules. Why?, ¢ Lipids are smaller molecular weight compounds., ¢ It is present as such in cells and also the chief component of cell membranes and cell, organelles., ¢ While we grind tissue, cell membranes and other membranes are broken into pieces, and form vesicles which are insoluble in acid., ¢ These vesicles get separated along with the acid insoluble pool and hence included in, the macromolecular fraction., Average composition of cells, , , , PROTEINS, ¢ Proteins are the polymers of amino acids and hence called polypeptides., ¢ Amino acids are linked together by peptide bonds.