Cell composition• Protoplasm – The term "protoplasm," from proto, first, and plasma, formed substance, was coined by the botanist Hugo von Mohl, in 1846, for the "tough, slimy, granular, semi-fluid“ – It was used 1839 by Czech physiologist Johannes Evangelista Purkinje (1787-1869) to denote the gelatinous fluid found in living cell. – Compose of inorganic and organic compounds like carbohydrates, proteins, lipids and nucleic acids
Cell Membrane• Plasma membrane / plasmolemma• Bi-lipid layer• Semi permeable• Serves as boundary between the outside environment and the inside environment• Outer membrane of cell that controls movement in and out of the cell
Cell Membrane• Fluid mosaic model – -S.J. Singer and Garth Nicolson in 1972 • - fluid because of I its hydrophobic components • such as lipids and membrane proteins thatmove laterally or sideways throughout the membrane. That means the membrane isnot solid, but more like a fluid.-mosaic that is made up of many different parts the plasma membrane is composed of different kinds of macromolecules
Cell Wall • Most commonly found in plant cells & bacteria • Supports & protects cells • Made of cellulose
Nucleus• Control center of the cell• Separated from cytoplasm by nuclear membrane/nuclear envelope• Contains genetic material – DNA arranged in thread like structure called chromatin• Also contain RNA and proteins• Nucleolus – distinct part in the nucleus where ribosome synthesis takes place
Nuclear Membrane• Surrounds nucleus• Made of two layers• Openings allow material to enter and leave nucleus
Chromosomes • In nucleus • Made of DNA • Contain instructions for traits & characteristicshttp://library.thinkquest.org/12413/structures.html
CytoskeletonThin and fibrousBones and muscles of cellsMicrofilamentsMicrotubules Centrioles and spindle fiberAmoeboid movement of amoeba, cilia byparamecium and flagellum by euglena aremade possible.