Lipid
Animals cannot convert fatty acids into glucose because

absence of malate synthase
absence of dehydrogenase
acetyl CoA can not be converted to pyruvate
absence of a-ketoglutarate dehydrogenase

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Lipid
Phospholipid contains

both (b) and (c)
long water-soluble carbon chains
hydrophilic heads and hydrophobic tails
positively charged functional groups

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