1A. Image of an amoeba shortly after transplant of a labeled nucleus (arrow). 1B. Autoradiograph image of the amoeba shown in 1A. Radioactivity appears in black, and is confined to the nucleus ...

Prokaryotic cells are surrounded by a plasma membrane, but they have no internal membrane-bound organelles within their cytoplasm. The absence of a nucleus and other membrane-bound organelles ...

cell membrane, which surrounds the cytoplasm, vacuole, the space within the cytoplasm which contains the fluids and nutrients, and a nucleus, which contains the cell's genetic material ...