Question

The formation of 1+2 and 3+4 secondary structures of 5′ UTR region mRNA from the trp operon is triggered when_______

Answer 1

The formation of the 1+2 and 3+4 secondary structures of the 5′ UTR region mRNA from the trp operon is triggered by a low level of tryptophan in the cell.

Step-by-step explanation:

The formation of the 1+2 and 3+4 secondary structures of the 5′ UTR region mRNA from the trp operon is triggered when there is a low level of tryptophan in the cell. The trp operon is a regulatory system in E. coli that controls the expression of genes involved in tryptophan synthesis. When tryptophan is absent, the repressor protein does not bind to the operator, allowing RNA synthesis to proceed and leading to the formation of the secondary structures.