Like all living organisms

• Single-___ (like an amoeba)
• Single-___ organism

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Celled \Celled\, a. Containing a cell or cells.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
in compounds, "having cells" (of a certain number or type), from late 18c., from cell (n.).

Wiktionary Word definitions in Wiktionary
a. 1 Containing cells; cellular. 2 (''in combination'') Containing a specific form or number of cells.