BIOL 1001 Lecture Notes - Lecture 8: Cell Membrane, Nuclear Membrane, Motorboat
Document Summary
Every living organism is made up of one or more cells. Cells need to exchange nutrients and wastes with the environment. No part of the cell can be too far away from the external environment. Encloses the cell and allows interactions with the environment. Composed of: lipids, proteins, and carbohydrate molecules. Regulate the passage of ions and molecules in and out the cell. All fluids and structures inside the plasma membrane, but outside the nucleus. Cytoplasmic fluid- water, salt, and other molecules. Cells use rna to copy the blueprint and guide construction of proteins. Details: less than 5 micro millimeters long, simple internal structure, stiff cell wall, no nuclear membrane or membrane bound organelles present. Some have internal membranes used to capture light. Shapes: spherical (cocci, rod shaped (bacilli, spiral (spirilli) Some bacteria and archaea use flagella for movement. Pili- protein projections in some bacteria that further enhance adhesion.
