27. E. coli does NOT have any ____ fatty acids, plants can introduce double bonds into fatty acids between ⁹ and the ____ -end of the chain, while mammals can only introduce double bonds between ⁹ and the ____ -end of the chain.
(A) saturated； carboxyl； methyl,
(B) mono-unsaturated； carboxyl； methyl,
(C) polyunsaturated； carboxyl； methyl,
(D) polyunsaturated； methyl； carboxyl,
(E) saturated； methyl； carboxyl.

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