BIOL 1201 : Exam2notes
Document Summary
The problem a cell and its environment: the interior of a cell is different than its environment, how to defend the internal environment but still communicate with the external environment, transport materials across the barrier, figure 7. 2. Integral membrane proteins: amphipathic, hydrophobic (nonpolar) regions, hydrophilic (polar) regions. Henrique and hansen 1901: raised pigs wearing underwear in a hot room, changed the properties of the subcutaneous fats, had a higher melting point, membrane fluidity can acclimate, membrane fluidity adjusted by changing the ratio. Increases the fluidity of the membrane: figure 7. 5, figure 7. 9. Direction of movement: expect down the concentration gradient. Transport processes: active, against concentration gradient, requires supplied energy (atp, carrier molecule. Active transport: work must be done, energy expended, figure 7. 20, 7. 21, 7. 18-6. Burning of coal: exergonic (exothermic, coal and oxygen, reactants, h2o and co2, products, the activation energy barrier, transition state, delta g double dagger, the height of this barrier determines the rate of the reaction.
