Question

Polarity: what condition must occur in order for a spontaneous STOP mutation to activate a Rho terminator embedded within a coding region?

A. The STOP mutation must be located between the rut site and the hairpin within the same coding region that contains the rho terminator.

B. The STOP mutation must be located upstream of the rut site within the same coding region that contains the rho terminator.

C. The STOP mutation must occur in the coding region immediately upstream of the coding region that contains the rho terminator.

D. The STOP mutation must be located after the hairpin of the rho terminator.

Answer 1

The condition that must occur for a spontaneous STOP mutation to activate a Rho terminator embedded within a coding region is the STOP mutation must be located upstream of the rut site within the same coding region that contains the rho terminator. Correct option is B.

Step-by-step explanation:

In order for a spontaneous STOP mutation to activate a Rho terminator embedded within a coding region, the STOP mutation must be located upstream of the rut site within the same coding region that contains the rho terminator. Rho-dependent termination is controlled by the rho protein and the polymerase stalls near the end of the gene at a run of G nucleotides on the DNA template.