The following are certain statements regarding secondary metabolites found in plants. Among the following, which is FALSE ?
Phenylalanine is an intermediate in the biosynthesis of most plant alkaloids
Plant secondary metabolites fall into three main groups, each with its own biosynthetic origin: terpenes, phenolic compounds and nitrogen-containing compounds such as alkaloids.
Alkaloids are by definition nitrogen-containing (usually heterocyclic, basic) compounds, and all terpenes are built from five-carbon isoprene units (isopentenyl and dimethylallyl diphosphate from the mevalonate or MEP pathway). Both statements are true.
Flavonoids have a C6–C3–C6 skeleton of 15 carbons: two aromatic rings joined by a three-carbon bridge, one ring coming from the shikimate pathway and the other from malonyl-CoA. This statement is true as well.
Most alkaloids are made from amino acids such as lysine, tyrosine, tryptophan, ornithine and arginine. Phenylalanine is the main precursor of phenylpropanoids, lignin and flavonoids through phenylalanine ammonia lyase, not an intermediate for most alkaloids, so this statement is false.
Hence, Phenylalanine is an intermediate in the biosynthesis of most plant alkaloids.
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