I looked up "immunotaggant" and got: a molecule attached to a foreign body or substance, marking it for phagocytosis and eventual elimination.

Prime can also be used to indicate which position a molecule has attached to, such as "5'-monophosphate".

Particular molecules will attach themselves to the enzyme surface so that atoms can be transferred rapidly.

When dispersed on a gold surface, the molecules attach themselves to the surface via their fullerene groups and are detected via scanning tunneling microscopy.

Two molecules of ApoC-II can attach to each LPL dimer.

Methyl groups and other small molecules may sometimes attach to certain spots on chromosomes, helping to relax tightly coiled strands of DNA so that genes can be expressed.

These molecules attach to integral membrane proteins, or penetrate the peripheral regions of the lipid bilayer.

Specifically, how can molecules (atoms) attract and attach to each other if they can't collide inelastically?

Smaller molecules will naturally attach themselves to the PAH rings.

The molecules also attach themselves to the faces, forming scatterings of jewel-like liver spots, bizarre stubble or scales.