The first strands of dna were observed through which microscope?

What is the difference between a scientific hypotheses and a scientific theory?

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

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.