BIOL 1001 Chapter : Ch 5
Document Summary
Dr. steven pomarico, instructor plants cellulose fungi chitin bacteria polysaccharides and peptides (long sugar molecules cross-linked together. >>>the cell membrane is usually the outermost barrier of the cell. An exception to this is found in cells which have a cell wall with peptides) The cell wall is mainly for structural support and protection. It usually doesn"t act as a barrier to molecules. Don"t think of the cell wall as a barrier, think of it as a knight"s suit. Highly regulated barrier; when and what is allows through it. The plasma membrane contains the cell but still allows the cell to interact with the environment. (see figs 5-1) If it"s going to be a barrier then it has to have something that will stop things from entering. Each cell must have a certain appearance so the membrane knows whether to accept or destroy it.
