Chapter 3:
21. The three major regions of a generalized cell are the plasma membrane which is the outer boundary of the cell, the cytoplasm which is the internal membrane consisting of intercellular fluid that is packed with organelles, and the nucleus which controls cellular activities and lies near the cell’s center.
22. The chemical composition of the plasma membrane is that it is a phospholipid bilayer; meaning t is made up of many different phospholipids which are phosphorous molecules connected to two lipid or fat tails. The phosphorous molecules are polar so they attract water but the lipids are non polar and repel it. Because of this all of the tails are drawn to each other and force the phosphorous molecules outward to protect them from the water creating a two layer membrane of phosphorous molecules with lipids sandwiched between them. This structure relates to the membranes function because there are both polar and non polar layers in the membrane and it will repel basically all molecules so the cell can decide what to let in through specially designed channels.