Final answer:
The term 'Nontranscribed Spacer' (NTS) refers to a DNA region that is not transcribed into RNA, and the associated region with this term in cellular processes is D) Nontranscribed Spacer.
Step-by-step explanation:
The term Nontranscribed Spacer (NTS) is associated with a region of DNA that is not transcribed into RNA. In the context of cellular processes, the correct answer to what region is commonly associated with the term "NTS" is D) Nontranscribed Spacer. This region is found in the genome and may play a role in the regulation of gene expression or in the structural organization of chromosomes, such as in the case of rRNA genes in the nucleolus where NTS sequences separate individual rRNA coding sequences. Unlike coding regions or exons, which are transcribed and eventually translated into proteins, nontranscribed spacers do not lead to the production of RNA molecules.