The series of cells observed which lack membrane-bound
internal organelle are called prokaryotes type of cells.
Prokaryotic organisms such as bacteria don’t have internal
membrane, or don’t have nucleus which makes it different from eukaryotic
organisms such as human beings.
And: Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Some molecules and ions such as glucose, sodium ions, and chloride ions are unable to pass through the phospholipid bilayer of cell membranes.
