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.
basically naked, not enveloped by a nuclear membrane. In addition to the genomic DNA (the single chromosome/circular DNA), many bacteria have small circular DNA outside the genomic DNA. These smaller DNA are called plasmids. The plasmid DNA confers certain unique phenotypic characters to such bacteria. One such character is resistance to ...
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