Answer Wiki. 1 Answer. It's a term of endearment, a nickname you might call your husband/girlfriend/boyfriend/wife. I haven't heard it used for real in several decades; it might be kind of archaic. There's a case to be made that it's also a bit condescending, but that would really depend on the relationship IMO.
DNA is mainly only found in the nucleus (if we disregard mitochondrial DNA). RNA is found in both nucleus and cytoplasm, as it is synthesized from the DNA template in the nucleus but is addressed to the cytoplasm, like a letter, a message (hence mRNA m for messenger) where it is translated into a protein by the ribosome.
There is also a base-level difference between DNA and RNA: A, C and G are common, but T is found only in DNA and U is found only in RNA (Fig. 2-5). Fig. 2-3. Nucleosides