how does the brownian motion affect the biological molecules?

Question

frostbite · Answer

Well the bronian motion is the "random" (not that random as some may think) motion of molecules, and can drive diffusion of molecules like monosaccharides.

Brownian motion can also affect the weak bonds (noncovalent bonds), which are corresponding to the typical interaction between two small milecules such as ions. for an example; In water, salt dissociates intro positively-charged sodium ions and negatively-charged chlorine ions. The wayer significantly screens the electrostatic force between ions, nevertheless experince a weak electrostatic bonding force. The strenght of the bond is sufficiently low that molecular Brownian motion (thermal jostling) often bumps one ion out of its binding with its counterpart.