Pick the statement that is false.
a. Transcriptional regulation is the most common mechanism of control in prokaryotes.
b. An Oc mutation on the bacterial chromosome can affect the expression of structural genes on a F plasmid.
c. Premature termination of the trp operon occurs in the presence of tryptophan charged tRNAtrp.
d. Repressible operons typically control enzymes in anabolic pathways.
e. Operator regions are often located between the promoter and structural genes they regulate.

An Oc mutation on the bacterial chromosome can affect the expression of structural genes on a F plasmid.

Explanation:

An Oc mutation is a mutation in which operator of an operon is constitutively active i.e. repressor fails to bind the operator which leads to unregulated gene expression.  

An Oc mutation do not affect the expression of structural genes on F plasmid because an operator is a cis regulatory element and therefore it can only affect the genes which are located on the same DNA. F plasmid genes are located on the plasmid not on the main chromosome of the prokaryotes while tryptophan or lac operon system is in the main chromosome that is why an Oc mutation will not impact genes on plasmid.