Transcription of UNIT 3 - NCERT
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UNIT 3 - NCERT
UNIT 3 Biology is the study of living organisms. The detailed description oftheir form and appearance only brought out their diversity. It is thecell theory that emphasised the unity underlying this diversity of forms, , the cellular organisation of all life forms. A description of cellstructure and cell growth by division is given in the chapters comprisingthis unit. Cell theory also created a sense of mystery around livingphenomena, , physiological and behavioural processes. This mysterywas the requirement of integrity of cellular organisation for livingphenomena to be demonstrated or observed. In studying andunderstanding the physiological and behavioural processes, one cantake a physico-chemical approach and use cell-free systems toinvestigate. This approach enables us to describe the various processesin molecular terms. The approach is established by analysis of livingtissues for elements and compounds.
DNA is used to monitor bacterial transformation with foreign DNA. Nuclear membrane is found in eukaryotes. No organelles, like the ones in eukaryotes, are found in prokaryotic cells except for ribosomes. Prokaryotes have something unique in the form of inclusions. A specialised differentiated form of cell membrane called mesosome is the ...
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