[gus_massa]

> In that article they mention the organism communicating across its body, i.e. reacting to stimuli in all parts in a correlated fashion, that is the bit referring to a quantum system.

The internal communication inside the cell is classical, not quantic (classic, like your phone). I guess it use some kind of internal hormone, but it may be some signal that propagates in the cell membrane. IANAB.

You can't have a good quantum correlation in something that is as big as a cell (unless you freeze it at ridiculous low temperature that are not posible for now and would kill the cell anyway, or you have a more ordered system like a extremely pure crystal, or you only want some correlation for ridiculous small amount of time).

You can have big entangled systems, but they look more like pair of very clear optic fiber, not like a cell with a lot of water and crap moving randomly inside.

There are also some interesting "big" quantum effects in molecules like chlorophyll. (I'm not sure if they are 100% confirmad yet.) But a molecule of chlorophyll is much much much smaller than the cell and the effect is very short lived.