15a) Most amino acid biosynthetic operons in prokaryotes have a structure similar to that observed in the trp operon: a long "leader" region that extends from the 5' end of the transcript to the start codon of the first coding gene, which includes both a "leader polypeptide coding sequence" and an "attenuator" sequence. In the histidine operon, for example, there is a "leader polypeptide coding sequence" that encodes a 16 amino acid peptide; this coding sequence includes 7 histidine codons in a row. What is the purpose to having such a coding sequence in the leader region of the transcript what does the cell gain by producing a polypeptide it will immediately recycle?

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A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.