<prompt> Which is not a PUFA?Linoleic acidPalmitoleic acidLinolenic acidArachidonic acid  <response>: POLYUNSATURATED FATTY ACIDS PUFAThe impoant polyunsaturated fatty acids are:Linoleic acid 18 C, 2 double bondsLinolenic acid 18 C, 3 double bondsArachidonic acid 20 C, 4 double bondsThey are present in good quantities in vegetable oils such as sunflower oil Fig. 7.2, Table 7.4. They are used to esterify cholesterol, whereby the latter can be excreted. So, PUFA, in general, are anti-atherogenicOther PUFAs belonging to very long chain fatty acids VLCFA are timnodonic acid 20 C, 5 double bonds; clupanodonic acid 22 C, 5 double bonds and cervonic acid 22 C, 6 double bonds. They are present in fish oils. They are impoant for development of the human brain.Ref: DM Vasudevan - Textbook of Biochemistry, 6th edition, page no: 161 