Lipid
Animals cannot convert fatty acids into glucose because

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

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Lipid
Phospholipid contains

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

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