Multiple choice How was a cell defined by Lowery and Scikevits? The structural, functional and biological unit of all organisms. A unit of biological activity surrounded by semipermeable membrane and capable of self-reproduction in a medium free of other living systems. Naked speck of protoplasm with a nucleus. Cells are organisms and entire plants and animals are aggregation of these organisms arranged according to definitive lam. Reveal answer Fill a bubble to check yourself B Correct answer Explanation This definition was given by Lowery and Scikevits.