Sept. 13: Opening early mountain quail season, and tree squirrel season. Sept. 13: Opening of general hunting season for blue and ruffed grouse. Sept. 15: Closing of dove season, first half. Sept. 20: Opening of band-tailed pigeon season in northern California. Sept. 20: Opening of general deer season zones B-1, B-2, B-3, B-5, B-6, C-1, C-2, C-3, C-4, D-6 and D-7. Sept. 20-21: Special Youth Hunt Days for waterfowl in the Northeastern California Zone. Sept. 21: Closing of general deer season zone A, South Unit 110 and North Unit 160. Sept. 27: Opening of early coastal quail season (Q2). Sept. 27: Opening of general deer season zone D-3, D-4, D-5, D-8, D-9 and D-10.
Phospholipids make up the basic structure of a cell membrane. A single phospholipid molecule has two different ends: a head and a tail. The head end contains a phosphate group and is hydrophilic. This means that it likes or is attracted to water molecules.
In cell biology, receptors are special structures that can be found in cell membranes. These are made of protein molecules such as glycoproteins. Receptors bind (attach) to specialised molecules. If the receptor has this molecule, it is activated, but if it does not it is deactivated.