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membranes

week 6

QuestionAnswer
Three forms of active transport ATP driven, coupled, light
Describe ATP driven transport Hydrolysis of ATP to ADP releases large amounts of energy which can be harnessed to drive thermodynamically unfavourable reactions
Describe coupled transport co-transported with a molecule that is moving down concentration gradient-net effect is favourable
The two main types of membrane protein transporters Carriers and channels
Describe carrier transport proteins Substrate molecule binds on one side of the membrane, the carrier undergoes conformational change and releases the substrate on the other side of the membrane
Describe channel transport proteins Form a hydrophilic pore within the membrane which can open or close, allowing passage of molecules through pore. Discriminates on basis of size and e- charge
What is a carbohydrate layer? A layer of sugar residues, including polysaccharide portions of proteoglycans and oligosaccharides attached to protein or lipid molecules, on the noncytosolic side of the membrane
Give examples of amphiphatic molecules phosphatidylcholine, phospholipids, sterol, glycolipids
Three ways in which proteins are imported into organelles Transport through nuclear pores, transport across membranes, transport by vesicles
Describe the constitutive exocytosis pathway Steady stream of vesicles that bud from the trans Golgi network and fuse with plasma membrane; supplying newly made lipids and proteins to membrane
Describe the role of chaperones and where they are found Class of proteins that recognise misfolding of proteins, which are directed to the cytoplasm for degradation. Chaperones are found in the ER.
Created by: 813890255
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