cell structure

• cell surface-membrane :

  fluid mosaic phospholipid bilayer with extrinsic and intrinsic proteins embedded
• cholesterol is a steroid molecule that reduces fluidity
• glycoproteins are cell signalling , cell recognition ad binding cells together
• glycolipids are also for cell signalling and cell recognition
• nucleus is surrounded by nulcear envelope , semi permable membrane , nuclear pores
• nucelus has a dense nucleolus made from RNA and proteins