Bio 161 Exam 2 Practice Questions and Complete Solutions

Endomembrane system components 1. Nuclear envelope 2. Endo Reticulum 3. Golgi aparatrus 4. Lysosomes 5. Plasma Membrane 6. Vesicles Endoplasmic Reticulum -extends off the nuclear envelope -a network of membrane bound compartments *rough ER and smooth ER* Exocytosis when a vesicles fuses with the plasma membrane *allows the vesicle to empty its contents into the extracellular space OR to deliver proteins embedded in the vesicle membrane to the plasma membrane* Endocytosis when a vesicles buds off the plasma membrane *this encloses material from the outside of the cell and brings it in* Rough Endoplasmic Reticulum (RER) *associated with ribosomes* -ribosomes synthesize PROTEINS that... 1. Will be inserted into the plasma membrane 2. Secreted outside of the cell 3. Shipped to another member of the endomembrane system aka are "the cargo" Smooth Endoplasmic Reticulum (SER) *lack ribosomes* -responsible for.. 1. The synthesis of fatty acids 2. Phospholipids 3. Steroids -also breaks down toxins Golgi aparatus and two sides A series of POLAR stacked flat sacks *an assembly line (modifies proteins) and and a traffic cop* Traffic cop: sends proteins to proper destinations by tagging them with specific molecules