Which of the following terms best characterizes catabolite repression associated with the lactose operon in e. coli? a. negative controlb. constitutivec. repressible systemd. positive controle. inducible system

Option C, Positive control

Explanation:

This process (as described in question) is termed as positive control of transcription. This is a positive control as it causes up regulation. Up regulation enhances or increases the rate at which an operon transcripts.  

This is also known as glucose effect and was first discovered in E.coli. To understand the glucose effect, a graph was plotted which depicted that bacteria utilizes glucose as an energy source till it get exhausted. After exhaustion of glucose, lactose is used for exponential growth

Hence, option C is correct

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.