NEET Biology Chapter 9

Biomolecules

There is a wide diversity in living organisms in our biosphere. Now a question that arises in our mind is Are all living organisms made of the same chemicals, i.e... elements and compounds? You have learnt in chemistry how elemental analysis is performed. If we perform such an analysis on a plant tissue, animal tissue or a microbial paste, we obtain a list of elements like carbon, hydrogen, oxygen and several others and their respective content per unit mass of living tissues. If the same analysis is performed on a piece of earth's crust an example of non living matters, We obtain similar list. What are the differences between the two lists? In absolute terms, no such differences could be made out. All the elements present in a sample of earth's crust are also present in a sample of living tissue. However a closer examination reveals that the relative abundance of carbon and hydrogen with respect to other elements is higher in any living organisms that in earth's crust

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