Lipid
Animals cannot convert fatty acids into glucose because

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

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Lipid
Phospholipid contains

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

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