Every cell, prokaryotic or eukaryotic, is surrounded by a thin layer of outermost boundary called the plasma membrane or cell membrane or plasma – lemma. The plasma membrane is a discrete structure and is remarkably complex in its molecular organization.... Read more
A structure containing a mass of cytoplasm surrounded by semi-permeable membrane called plasma membrane is called a cell. It encloses cytoplasm, many cell organelles along with nucleus or nuclear material. On the basis of organization of membranes, variety and structure... Read more
The first two precepts of Cell Theory were enunciated near the middle of the 19th century, after many observations of plant and animal cells revealed common structural features (e.g., a nucleus, a wall or boundary, a common organization of cells... Read more