Lipid
Animals cannot convert fatty acids into glucose because

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

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Lipid
Phospholipid contains

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

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