Why is DNA required in every cell

In order for something to be considered living it needs DNA. DNA, or deoxyribose nulceotide, is a neulic acid that is the blueprint for mRNA, messenger RNA, which codes for amino acids. The expression or coding of these amino acids is known as gene expression. Genes don't just give you physical appearence, they controll everything. If cells did not have DNA they would just just exist as a sac of organelles that dont carry out their jobs.