Short-range noncovalent bond

Short-Range Noncovalent Bond Interactions in Molecular Switching Processes... 

In summary, the interactions between rhodopsin and its two partners, transducin and arrestin, echo the general scheme of interactions of mobile electron carriers, discussed earlier, despite the differences in terms of structures and functions. Again, nature deployed short-range noncovalent bond interactions to make collisions and reactions between encountering partners more deterministic than random processes. Nature also orchestrated the sequence of events with appropriate timing. When the interactions between Gt and Mil need to be more deterministic, the interactions between arrestin and Mil are made more random. Conversely, when the interactions between arrestin and Mil need to be more deterministic. 

The short-range valence or chemical forces resonance bonding Virtually by definition, the forces between molecules cannot be ascribed to covalent bonds such as those that link atoms within molecules. Hence, such forces may be (and often are) tautologically labeled as noncovalent to distinguish them from the strongest 2c/2e covalent bonds that underlie the formation of molecules. (Nearly as uninformative is the designation weak bonding, which... 

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