What is the longest molecule?

  • #1

Summary:

Longest DNA, nanotube, polymer, silk, nylon, glass, wire

Main Question or Discussion Point

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?
 

Answers and Replies

  • #2
Borek
Mentor
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What have you found so far?

Why do you think things you listed count as molecules? What is a molecule?
 
  • #3
4
1
Carbohydrates, Proteins, Lipids, Nucleic acid are Four Large Molecules
 
  • #4
DaveC426913
Gold Member
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Seconding Borek's question: you should first learn what defines a molecule. That will make the answer to your quiz quite simple.
 
  • #5
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?
 
  • #6
268
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Aren't proteins and lipids very much smaller?
I think only lipids falls in micromolecules and proteins are macromolecules.
 
  • #7
chemisttree
Science Advisor
Homework Helper
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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....
 
  • #8
1,608
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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!)
 

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