BIOL 1001 Chapter : Chapter 4 Cell Structure And Function
Document Summary
Plasma membrane- extremely thin, rather fluid membrane; consists of a phospholipid bilayer; some materials can diffuse through the membrane. Isolates the cell"s contents from the external environment: regulates the flow of materials into and out of the cell, allows interactions with other cells and with the extracellular environment. Proteins facilitate communication between the cell and the environment. Some promote chemical reactions: all cells contain cytoplasm. Cytoplasm- consists of all the fluid and structures that lie inside the plasma membrane, but not outside of the nucleus: most of the cell"s metabolic functions occur here. There are two basic types of cells: prokaryotic and eukaryotic: prokaryotic- without a nucleus, bacteria and archae- are prokaryotic, eukaryotic- contain a nucleus where the genetic material is located. 4. 3 what are the major features of eukaryotic cells: usually larger the prokaryotic cells, organelles- membrane-enclosed structures, such as the nucleus and mitochondria, that perform specific functions within the cell.
