Subject: can big molecules like proteins or dna (200bp etc) evaporate?

as i know not only small molecules, but also big molecules like oil can 
evaporate (this is also what i experienced in my kitchen). of course 
evaporation should decrease drastically, with increasing molecular weight. but 
biomolecules like 200 bp dna may be 200 times bigger that a tri-glyceride 
molecule. can it still evaporate in very very small quantities? if it does, 
how can its vapor pressure be calculated? i am a molecular biologist and this 
is something i experienced through a contamination problem in pcr. the only 
explanation to my contamination is the evoporation of dna molecules at high 
temparatures like 95C.

Re: can big molecules like proteins or dna (200bp etc) evaporate?