Osmosis and diffusion are different because: a. only diffusion occurs across a cell membrane. b. diffusion may lead to lysis or crenation. c. diffusion is active transport, whereas osmosis is passive transport. d. osmosis only occurs across a semi-permeable 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.