Which of the following mutations would make Lac operon regulation unresponsive to glucose levels.

a. A mutation in CRP that makes it unable to bind cAMP
b. A mutation in LacI that makes it unable to bind lactose
c. A mutation in LacI that makes it unable to bind glucose
d. A mutation in CRP that makes it unable to bind glucose

A

Explanation:

The lac (lactose) operon is made up of a group of genes that encodes for proteins that are responsible in converting lactose into glucose.The lac operon is found in bacteria such as E.coli , and it is made up of three structural genes:

lacZlacYlacA

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.