Begin is the common term: to begin knitting a sweater. Commence is a more formal word, often suggesting a more prolonged or elaborate beginning: to commence proceedings in court. Initiate implies an active and often ingenious first act in a new field: to initiate a new procedure.
Structure of the trp operon. The trp operon is an operon â a group of genes that are used, or transcribed, together â that codes for the components for production of tryptophan. The trp operon is present in many bacteria, but was first characterized in Escherichia coli.The operon is regulated so that when tryptophan is present in the environment, the genes for tryptophan synthesis are not expressed.It was an important experimental system for learning about gene regulation, and is commonly used to teach gene regulation.he trp operon is present in many bacteria, but was first characterized in Escherichia coli. The operon is regulated so that when tryptophan is present in the environment, the genes for tryptophan synthesis are not expressed.
The metabolism of tryptophan is an interesting example of biological control of amino acids. Tryptophan in the gut can be converted by bacteria to indoxyl, which is then absorbed into the blood and sulfated by the liver to produce indoxyl sulfate in the urine, sometimes called indican.This is a substance related to amino acid malabsorption or intestinal toxicity reactions.ryptophan is an essential amino acid. This means that it must be obtained through the diet in adequate quantities to meet the body's needs. Tryptophan is a precursor in the central nervous system of the neurotransmitter serotonin.