IOMOLECULES

142 BIOLOGYT here is a wide diversity in living organisms in our biosphere. Now aquestion that arises in our minds is: Are all living organisms made of thesame chemicals, , elements and compounds? You have learnt inchemistry how elemental analysis is performed. If we perform such ananalysis on a plant tissue, animal tissue or a microbial paste, we obtain alist of elements like carbon, hydrogen, oxygen and several others andtheir respective content per unit mass of a living tissue. If the same analysisis performed on a piece of earth s crust as an example of non-living matter,we obtain a similar list. What are the differences between the two lists? Inabsolute terms, no such differences could be made out. All the elementspresent in a sample of earth s crust are also present in a sample of livingtissue. However, a closer examination reveals that the relative abundanceof carbon and hydrogen with respect to other elements is higher in anyliving organism than in earth s crust (Table ).

BIOMOLECULES 145 HO Phospholipid (Lecithin) Cholesterol Fats and oils (lipids) CH 3 (CH ) 2 14 COOH Fatty acid (Palmitic acid) Glycerol Triglyceride (R 1, R 2 and R 3 are fatty acids)

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