Biology 2581B Chapter Notes - Chapter 5: Pita, Tight Junction, Golgi Apparatus
3 May 2020
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Document Summary
The endomembrane system - regulates protein traffic and performs metabolic functions in the cell. The membranes of this system are related either through direct physical continuity or by the transfer of membrane segments as tiny vesicles: endoplasmic reticulum: a network of membranous tubules and sacs called cisternae. Smooth er has no ribosomes and is responsible for synthesis of lipids, metabolism of carbohydrates, detoxification of drugs and poison and storage of calcium ions. Rough er is studded with ribosomes on the outer surface and aids in synthesis of proteins from bound ribosomes, adds carbohydrates to proteins to make glycoproteins and produces new membrane. Receives transport vesicles and their products (proteins, carbohydrates, phospholipids, polysaccharides) after they leave the er and modifies, stores and then sends them to other destinations. Er is located near the er and is the receiving side (through fusion of membranes). They can kill the cell when they break open. Unicellular organisms eat by engulfing food particles (fagocytosis).
