Fatty acid elongation occurs in which pa of cell -

Ans. is 'b' i.e.,MitochondriaThere is one step (occuring in cytosol) in synthesis of fatty acid called elongation which involves elongation of synthesizing fatty acid chain by adding carbon atoms.But this is not elongation of fatty acid, it is elongation of incompletely synthesized fatty acid chain which leads to formation of a fatty acid (not elongation of fatty acid) The final product is a fatty acid and only after completion of this the product becomes fatty acid.Elongation of fatty acid refers to elongation of chain of already existing (or full synthesized) fatty acid. This occurs in microsomes (smooth ER) and mitochondria.