This seems to be a simple question but I have failed to find an answer by searching.
Let's consider human DNA so 23 chromosomes.
The first question is on the double helix, is that considered as one or two molecules? This is the less interesting question to me as I know the structure and it is mainly a matter of the definition of the term molecule.
The bit that is more interesting to me and I cannot find a clear answer on is the chromosomes. Is each chromosome a separate molecule or pair of molecules (hence 23 or 46) or is the whole of the DNA a single molecule or pair (hence 1 or 2). If each chromosome is not a separate molecule then how are they connected? If the whole DNA is a single molecule or a pair then what happens at the chromosome boundary?
I am trying the chemistry stack exchange as I am just interested in the chemical structure and not its biological function.
A clarification: I am not suggesting that a chromosome consists solely of DNA. I mean the DNA within the chromosome.