1 House feeders. 2  These keep seed in a contained area and dispense it as the birds feed from a small tray at the bottom of the feeder. 3  Window feeders. 4  Window feeders attach to your window with suction cups, offering a full view of bird activity.. Research birds in your area. Find out what types of birds live in your area or are likely to come to your property through migration. You may want to obtain a field guide to the area in order to know which birds to attract.
Phospholipids. Phospholipids make up an important class of lipids for the construction of cell membranes. The phospholipids are not true fats because they have one of the fatty acids replaced by a phosphate group.This sketch of a phospholipid molecule shows two fatty acids and a phosphate group attached to a glycerol backbone.hospholipids. Phospholipids make up an important class of lipids for the construction of cell membranes. The phospholipids are not true fats because they have one of the fatty acids replaced by a phosphate group.
All eukaryotic cells have a cell surface membrane (also known as a plasma membrane). It is very fragile and its role is to hold the cell together and to help control what substances can get in and out. It is partially permeable, allowing only some substances to pass through it. The membrane has a complex structure consisting of a phospholipid bi-layer and different types of proteins. Phospholipids. These layers are constantly moving, creating small pores which allow small particles to pass through by diffusion and osmosis. Some of the lipids in the cell surface membrane are triglycerides. These are molecules formed from glycerol by reaction with fatty acids, phosphoric acid or simple sugars.