Astudent examines a spell under the microscope and determines that it is a eukaryote. all but one structure could the student come to this conclusion. which structure is of no ? a) cell wall b)golgi body c) mitochondrion d) membrane-bound nucleus

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.