Final answer:
The claim that the gene for tryptophan production in bacteria is regulated by feedback mechanisms is true. The presence or absence of tryptophan can either repress or activate the trp operon involved in its synthesis.
Step-by-step explanation:
The gene for tryptophan production in bacteria is indeed regulated by feedback mechanisms, making the statement true. In bacteria such as Escherichia coli (E. coli), tryptophan synthesis is choreographed by a cluster of five genes known as the tryptophan (trp) operon. When environmental levels of tryptophan are high, it binds to a repressor protein that attaches to the operator sequence, physically blocking RNA polymerase and thus preventing the transcription of the trp operon's genes. Conversely, when tryptophan is scarce, the repressor protein detaches from the operator, allowing the transcription and subsequent translation of the operon's genes to synthesize tryptophan.