In the shikimate pathway, which intermediate is the immediate precursor to phenylalanine, tyrosine, and tryptophan?

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Multiple Choice

In the shikimate pathway, which intermediate is the immediate precursor to phenylalanine, tyrosine, and tryptophan?

Explanation:
In the shikimate pathway, chorismate sits at the common branch point that leads to all three aromatic amino acids. From chorismate, the pathway splits: one route goes to anthranilate for tryptophan, while another goes to prephenate (prephenic acid) for phenylalanine and tyrosine. Because chorismate is the shared precursor before these separate routes diverge, it is the immediate precursor to phenylalanine, tyrosine, and tryptophan. Shikimic acid and anthranilic acid are earlier or more specific intermediates and do not serve as the universal starting point for all three amino acids.

In the shikimate pathway, chorismate sits at the common branch point that leads to all three aromatic amino acids. From chorismate, the pathway splits: one route goes to anthranilate for tryptophan, while another goes to prephenate (prephenic acid) for phenylalanine and tyrosine. Because chorismate is the shared precursor before these separate routes diverge, it is the immediate precursor to phenylalanine, tyrosine, and tryptophan. Shikimic acid and anthranilic acid are earlier or more specific intermediates and do not serve as the universal starting point for all three amino acids.

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