Ncert Exercises & Solutions

The genomic contentof the nucleus is constant for a given species where as the extrachromosomal DNA is found to be variable among the members of a population. Explain.

in bacteria, additional to the genomic DNA, small circular DNA molecules are present in These small molecules are called plasmids. They confer unique phenotypic character to bacteria, i.e., resistance to antibiotics. It is also used to monitor bacterial transformation with foreign DNA.

In eukaryotes, the extra DNA molecules are present. in chloroplast (stroma) and mitochondria (matrix). Because of the presence of this DNA molecule, they are treated as self autonomous organelles. in case of highly active organism, the DNA extrachromosomal is found to be more as comparedto the less active ones.

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