CAIE A-Level Biology A2 16.3.1 Structural Genes Vs Regulatory Genes Questions

The lac operon of prokaryotes contains a group of structural genes that are under the same control and are transcribed together.

Another operon found in prokaryotes is the trp operon.
Fig. 6.1 summarises the structure and control of the trp operon.

$\operatorname{trp} A$ is an example of a structural gene and $\operatorname{trp} R$ is an example of a regulatory gene. Describe the differences between the functions of structural genes and regulatory genes.