BIOL 1201 Lecture : Week5Notes
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Mosaic of proteins embedded in it: figure 7. 2, 7. 3, 7. 5. Passive transport = diffusion across a membrane: substances diffuse down their concentration gradient, from high to low concentration, passive transport = no energy is expended by the cell to make it happen, figure 7. 13. Parts that cross the membranes are the hydrophobic ones. Atp often drives endergonic reactions by phosphorylation, transferring phosphate to some other molecule. The recipitent molecule is now called a phosphorylated intermediate: may be a substrate or the enzyme itself. Figure 8. 11: atp is a renewable resource that is regenerated by addition of a phosphate group to (adp) Compete with the substrate: non competitive inhibitors. Decrease activity: examples of inhibitors include toxins, poisons, pesticides, antibiotics, and many drugs, figure 8. 17, regulation of enzyme activity helps control metabolism, switching on or off the genes that encode specific enzymes, regulating enzyme activity. Allosteric regulation may wither inhibit or stimulate an enzyme"s activity.
