Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos?

This is the interaction of two organisms where one is and the other is neither nor harmed.

During the process of blank and molecules such as a glucose must use a protein channel to cross through a cell membrane

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.