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.
Tryptophan is a precursor for 5-HTP, which is subsequently a precursor serotonin and melatonin. Therefore, tryptophan or 5-HTP may be consumed or supplemented to increase levels of both serotonin and melatonin in the body.ryptophan and 5-HTP can be converted into serotonin in the digestive tract but must transported to the brain where it is then synthesized into melatonin. The pineal gland in the brain switches on melatonin synthesis when it detects lower levels of light in the ambient environment.