What is the Longest Molecule Ever Discovered?

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mollwollfumble
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TL;DR
Longest DNA, nanotube, polymer, silk, nylon, glass, wire
What is the longest molecule? Are we talking about of order of magnitude:
  • 1 metre, eg. DNA, carbon nanotube, polyethylene (UHMWPE)?
  • 1 kilometre, eg. silk strand, monofilament nylon?
  • 100 to 1,000 km, eg. steel wire for suspension bridge, copper wire, optical glass fibre?
  • 12,700 km, covalent bonding connecting the whole of the Earth's crust?
 
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What have you found so far?

Why do you think things you listed count as molecules? What is a molecule?
 
Carbohydrates, Proteins, Lipids, Nucleic acid are Four Large Molecules
 
Seconding Borek's question: you should first learn what defines a molecule. That will make the answer to your quiz quite simple.
 
naresh123 said:
Carbohydrates, Proteins, Lipids, Nucleic acid are Four Large Molecules
Carbohydrates and nucleic acids can each by up to of order two metres long. Aren't proteins and lipids very much smaller?
 
mollwollfumble said:
Aren't proteins and lipids very much smaller?
I think only lipids falls in micromolecules and proteins are macromolecules.
 
I had a professor that said it was the ocean since water is always in the process of taking/borrowing hydrogens. He said that touching a water molecule along the shore here in North America had an effect on a water molecule in Antartica. I always wondered how he would prove something like that...
 
What is the distinction between a crystalline solid (or a metal) and a molecule? There are individual atoms and variously stable agglutinations of atoms: to me the other designations seem arbitrary (and possibly capricious!)
 
An nth-length alcohol or something similar would probably be the longest.
 
hutchphd said:
Can't one make certain polymers as long as is desired? Maybe thermodynamic fluctuations produce a practical limit?? Seems like you just add another monomer.

That was my understanding. You can just keep stitching carbon atoms on the end in a DNA-Like structure and keep going forever. I wonder if a degenerate star counts as being a molecule? I suppose it has to be pure chemical forces and not gravity holding it together.