E. coli does NOT have any ____ fatty acids, plants can introduce double bonds into fatty acids between Δ9 and the ____-end of the chain, while mammals can only introduce double bonds between Δ9 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