When a snake flicks its tongue, it is gathering odor particles for transfer to two fluid-filled sacs at the roof of the mouth -- Jacobson's organs -- that lead to a second, smaller olfactory chamber. The tongue is used only to assist in this process; snakes do not have a sense of taste.
A eukaryote is a type of cell (or unicellular organism) that possesses a nucleus and membrane-bound organelles, in contrast to prokaryotes (bacteria and archaea) which don't. Eukaryote means good/true nut/kernel in Greek, referring to the nucleus, while prokaryote means before nut/kernel.
eucaryotic; eukaryotic. Antonym: prokaryotic (having cells that lack membrane-bound nuclei) Pertainym: eukaryote (an organism with cells characteristic of all life forms except primitive microorganisms such as bacteria; i.e. an organism with 'good' or membrane-bound nuclei in its cells)