PLB 300 Lecture Notes - Lecture 4: Galactose, Membrane Protein, Signal Transduction
Document Summary
Membrane structure: compartmentalization - membranes enclose entire cell or diverse intracellular spaces in which occur specialized activities that proceed with little outside interference & are regulated independently a. A cell"s various membrane-bound compartments have markedly different contents: scaffold for biochemical activities membranes are also distinct compartments themselves a. They prevent the unrestricted exchange of molecules from one side to the other - control what gets into & out of cell; h2o moves easily b. They also provide the means of communication between the compartments they separate: transporting solutes they have transport machinery to move substances from one side to the other a. Can transport substances (ions, sugars, amino acids, etc. ) up or down concentration gradient; sugars & amino acids taken up since they are needed to fuel metabolism & build macromolecules b. & fats to atp: allows storage of energy in gradients. A brief history of studies on the structure of the.
