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.
Various alterations in corresponding genes affect the levels of serotonin or sensitivity to serotonin and may cause behavioral changes. Changes in serotonin level can affect behavior. The level of serotonin is controlled by multiple mechanisms.Any changes in the genes involved may lead to serious consequences.everal genetic alterations in the gene for tryptophan hydroxylase were reported to be associated with suicidal behavior. This enzyme is involved in biosynthesis of serotonin, and therefore its genetic alterations can easily affect the level of this mediator.