BIO152H5 Lecture Notes - Lecture 3: Hydrophile, Viscosity, Cholesterol

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Fats have a larger energy supply compared to other macromolecules. Hydrophobic = scare of water (phospholipid bi-layer) Large molecules assembled from smaller molecules (condensation: saturated fat: Maximum number of hydrogen atoms c c. Linear shape of fatty acids allows them to stack easily. Less than the maximum number of hydrogen atoms. Fats are a combination of single bonds and double bonds. Poly many c = c bonds and monosaturated only one c = c: fats: + insulation: very important role in hibernation: hydrogenated fat: Converst unsaturated c = c doulble bonds into c c single bonds. Done industrially under temperatures and preassures: trans fats: (cid:894)the (cid:271)ad (cid:271)it(cid:272)hes do(cid:374)"t (cid:272)o(cid:374)su(cid:373)e(cid:895) Hydrogenation: a by-product of hydrogenation is also the creation of trans fat: some of the cis double bonds are converted to trans double bonds. Our bodies have a hard time breaking them down. We evolved to only break down cis positioned unsaturated fats. Clogging of arteries (plaque formation) = high cholesterol.

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