the cell is capable of regulating gene expression in a variety of situations and environments. valid reasons for a cell to regulate gene expression include its ability to: make additional cells of the same type in response to a demand. (click to select) synthesize enzymes to metabolize a particular nutrient. (click to select) keep a gene product available under all conditions. (click to select) execute a specific program of development (e.g. to become a blood cell or immune cell). (click to select) stop synthesis of a cellular component when there is enough available in the cell. (click to select) synthesize mrna for every gene in the genome at all times. (click to select)