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

The correct option is B.

B)the work to do the job is made easier

Explanation:

The work to do the job is made easier because it becomes easy to move object on high elevation, the sloping surface of the inclined plane support and hold part of the object weight. It then require little force or work to move the object up the hill compare to straight up height.