Hydrophilic heads and hydrophobic tails The tails are made of carbons and

Hydrophilic heads and hydrophobic tails the tails are

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Hydrophilic heads and hydrophobic tails. The tails are made of carbons and hydrogens – nonpolar. Inside of the cell, there is cytosol, which is aqueous. There is a bilayer formed. A protein (receptor, channel, etc.) that wants to let something in – needs to be nonpolar and polar – transmembrane proteins are nonpolar in the middle and polar on the outsides. Nonpolar/ hydrophobic interactions inside the membrane = transmembrane protein & integral protein (go across membrane and have both characteristics) Energy Energy in a system – energy that is actual inside the molecules and whatnot & also energy that’s just available for usage. Free Energy in a system = energy that is not being used. ∆G= energy available = ∆H (Enthalpy) – T ∆ S (Entropy) ∆G=∆H-T∆S Entropy = disorder general trend towards high entropy in the universe (life has low entropy) If you have a reaction A B + C (B+C have higher entropy value because less ordered) Reactions that increase entropy have positive ∆S Increasing entropy has positive ∆S Things make bonds to become more stable (pursuing lower energy level) Catabolic = breakdown (glycolysis) Transport Channel protein – something that facilitates the movement of (typically) charged particle – don’t use energy Carrier protein – typically accommodates for bigger molecules
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