How does the lac operon help E. coli conserve energy and other resources?

A lac operon is a group of three genes that are always transcribed together which code proteins needed for the metabolism of lactose. ... This way of transcription control preserves the energy of E. coli, so proteins that these bacteria need in presence of lactose aren't synthesized when this molecule is absent.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.