Search also in: Web News Encyclopedia Images. striking 1 adj Something that is striking is very noticeable or unusual. The most striking feature of those statistics is the high proportion of suicides..., He bears a striking resemblance to Lenin. â¦ strikingly adv usu ADV adj In one respect, however, the men really were strikingly similar., ...a strikingly handsome man... 2 adj Someone who is striking is very attractive, in a noticeable way. She was a striking woman with long blonde hair.
cell membrane. the outer boundary of the cytoplasm, a layer that controls what enters and leaves a cell.thin, flexible barrier around a cell, regulates what enters and leaves the cell. cell wall. a protective outer covering that lies just outside the cell membrane of plant cells.
All living cells have a plasma membrane that encloses their contents. In prokaryotes, the membrane is the inner layer of protection surrounded by a rigid cell wall. Eukaryotic animal cells have only the membrane to contain and protect their contents. These membranes also regulate the passage of molecules in and out of the cells.