Mention 6 substances secreted by the body​

What is the one part of the nucleotide  that differs among the other different nucle  tides?

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?

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.