What type of DNA is found in all nucleated cells of the body?

Nuclear DNA is found in all nucleated cells of the body because it resides within the nucleus of each cell. This type of DNA contains the genetic information necessary for the development, functioning, and reproduction of an organism. Each cell, excluding red blood cells and certain others which lack a nucleus, possesses this DNA which is inherited from both parents and acts as a blueprint for an individual's genetic traits.

In contrast, mitochondrial DNA is found specifically in mitochondria, the energy-producing structures within cells, and is inherited solely from the mother. Ribosomal RNA, while crucial for protein synthesis, is not a type of DNA at all but rather a form of RNA that contributes to ribosome structure and function. Plasmid DNA is typically found in bacteria and serves as extra-chromosomal DNA; it is not present in human nucleated cells. Thus, nuclear DNA is the only form that meets the criteria of being present in all nucleated cells of the body.