Organelles and Functions:
• Rough Endoplasmic Reticulum: Responsible for the assembly of many proteins • Cell Membrane: Controls the movements in & out of the cell and organelles • Golgi Apparatus: Process and bundle macromolecules like proteins and lipids • Mitochondria: Perform cellular respiration 0 Breaks nutrients into energy • Nucleus: Contains a majority of the genetic material • Nucleolus: Rewrite ribosomal RNA and combine it with proteins • Smooth Endoplasmic Reticulum: Makes cellular products like hormones and lipids • Lysosome: Digestion and waste removal • Flagella: Allows cells to move • Vesicle: Transport vesicles move molecules within the cell • Ribosomes: Makes proteins within cells • Cytoskeleton: Gives cells shape, support, and facilitates movement
Why is the term "Fluid Mosaic" used to describe the membrane structure?
Cell membranes are “fluid mosaics” in whichmembrane proteins move amongst the phospholipids.The phospholipid bilayer is the fluid portion of the
membrane.A mosaic of proteins is embedded within the bilayer, Membranes are dynamic, ever-changing structures.
• A flexible layer made of lipid molecules is interspersed with large protein molecules that act as channels through which other molecules enter and leave the cell.
Why do the fatty acid tails align themselves in the middle of the membrane?
• Polar molecules are attracted to the water inside the cell or to the water outside the cell. However, they cannot interact with the nonpolar tails of the phospholipids within the lipid bilayer. The result is that the interior part of the cell membrane forms a nonpolar zone that acts as a bather to polar molecules.