The proteins necessary for the use of lactose in e. Coli are collectively called the

lac operon

Explanation:

The lac operon or lactose operon is found in E. coli which consist of genes that codes for proteins that are responsible for tranferring lactose into the cytosol and it further digested into glucose. The glucose further used for producing energy.

Hence, The correct answer is lac operon.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a