Many mutations have been identified in the lac operon. a particular mutation prevents the repressor protein from binding to the operator under all circumstances. select all conditions which will lead to the operon being "on" with this mutation (for the purposes of these questions, either an extremely low level of expression or completely off are equivalent) mark all that apply

select one or more:
a. - glucose, + lactose correct
b. - glucose, - lactose correct
c. + glucose, - lactose
d. + glucose, + lactose