BIOC 405 Study Guide - Midterm Guide: Glucokinase, Cystine, Cytosol
Document Summary
Boundary defines cells and organelles, but must be selectively permeable and allow for transmission of molecules and information. Membranes can be used to store and utilize energy. Must maintain concentration gradients, proton/ion gradient (eg. h+, na+, These gradients are used for transport and signaling. Must be flexible adopt various shapes and be self-sealing. Because it is interacting with a lot of different types of molecules, particularly proteins, it can"t have any gaps or openings that could disrupt the function of the membrane. Must accommodate proteins of various types and shapes. Must allow for diffusion (both lipids and proteins) Must allow for vesicle formation and membrane fusion. Must be adaptable to varying cellular conditions and functions. Ex: end of nerve cell w/neurotransmitters (glutamate); nerve cell receives an impulse and the neurotransmitter-filled vesicles fuse with the plasma membrane to release their content into the synaptic cleft. Fatty acids: important building blocks of glycerophospholipids and many other lipids like sphingolipids and fats.
