Biological Membranes Flashcards
What model are proteins described as and why?
The ‘fluid-mosaic model’ because the proteins are distributed in a mosaic pattern and vary in shape + size
What are the roles of intracellular membranes?
Partially-permeable, chemical reaction site, transport of substances internally, fixed chemical environment
What are the roles of external membranes?
Transport, chemical reaction site, anchorage, maintaining environment
What’s the difference between an intrinsic and extrinsic protein?
Intrinsic proteins go through the membrane
What are the two types of integral proteins?
Carrier and channel proteins
What are the functions of membrane proteins?
Junctions Enzymes Transport Recognition Anchorage Transduction (receptors)
What do carrier proteins do?
Used in passive and active transport (often change shape)
What do channel proteins do?
Used in diffusion of polar molecules and ions (hydrophilic)
What is the role of glycoproteins in cells?
They’re a recognition sight for cell signalling.
What is the role of glycolipids in cells?
Cell markers or antigens and have similar roles to glycolipids.
