Please enable JavaScript.

Coggle requires JavaScript to display documents.

Membrane structure, synthesis and transport - Coggle Diagram

- - - - Membrane is a mosaic of lipid, protein, and carbohydrates
      - Membranes resembles fluid because lipids and proteins can move
        
        Proteins bound to membranes
        
        Integral or intrinsic
        
        Transmembrane proteins physically embedded in the hydrophobic portion of the phospholipid bilayer
        
        Lipid anchored proteins covalently attached to a lipid with the help of the proteins amino acid
        
        Peripheral or extrinsic
        
        Non covalently bound either to integral membrane protein projecting form the membrane or to polar head groups o phospholipids
- - - - High conc. of cholesterol
      - Unique set of membrane proteins
      - Play a role in endocytosis and cell signaling
- - - - Glycolipid
      - Glycoprotein
      - N- linked glycosylation : attachment of carbohydrate to nitrogen atom of asparagine. occurs in ER
      - O-linked Glycosylation: addition of sugars to oxygen atom of serine or threonine side chains. Occurs only in Golgi
- - - - Animal cells: shrink- crenation(hypertonic), Swelling-Osmotic Lysis (hypotonic)
      - Plant cell: swelling- Turgor pressure, shrinkage- plasmolysis
  - - - Forms an open passageway for the direct diffusion of ions or molecules across membranes
    - - Conformational change transports solute across membrane. principal pathway for uptake of organic molecules like sugars, amino acids, nucleotides.
        
        Uniporter: single molecule or ion
        
        Antiporter: two or more molecules in opposite directions
        
        Symporter/cotransporter: two molecules or ions in the same direction