Both saturated and unsaturated phospholipid tails are possible. Whether or not there are double bonds between the carbons in the fatty acid tails is what is meant by the labels saturated and unsaturated. Due to the absence of double bonds, saturated tails are straight and unkinked.
Major membrane lipids called phospholipids are made up of lipid bilayers. More crucially, this fundamental cellular structure makes it possible for numerous cellular functions to take place in subcellular compartments while also acting as a barrier to guard the cell against various environmental insults. Unsaturated fatty acids, on the other hand, are a part of the phospholipids that make up cell membranes and support membrane fluidity.
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