Human beings are composed of progressively larger units of organization. Which unit of organization includes all the others? cells
organs
systems
tissues
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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.

Produce proteins by following coded instructions that come from the nucleus of the cell.

What characteristic makes a cell membrane selectively permeable