Q: What happens to structural genes in the presence of tryptophan?


Read this paragraph and choose the correct option from the provided answers:

Structure of the trp operon. The trp operon is composed of 5 structural genes, 1 regulatory gene and other regulatory sequences, including the promoter, operator and leader sequence. Within the leader sequence is the attenuator region. In the presence of tryptophan, the structural genes are not transcribed.

 Choices:

- they are not oxidised

- they are transcribed

- they are exterminated​

- they are not transcribed


A:
they are not transcribed