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Lecture 3

BIO152H5 Lecture Notes - Lecture 3: Conjugated Linoleic Acid, Unsaturated Fat, Saturated Fat


Department
Biology
Course Code
BIO152H5
Professor
Maria Arts
Lecture
3

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BIO152 Lecture 3: Lipids and Cell Membranes
Outline
-Lipids
-Saturated versus unsaturated fat
-Hydrogenation process- trans fat
-Essential fatty acids
-Steroids
-Phospholipids
-Cell Membrane
-Fluid mosaic model
Evolutionary Connection
-Macromolecules: All living organisms contain large molecules such as protein,
carbohydrates, nucleic acids, lipids.
Lipids
-Carbon-containing compounds that are largely non-polar (non-ionic substance) and
hydrophobic (afraid of water).
-Large molecules assembled from smaller molecules (dehydration: removing water)
-Major group of organic molecule.
-Lipids are made up of the same elements as carbohydrates (carbon, hydrogen, and
oxygen).
Saturated Fat
-Saturated fats are simply fat molecules that have no double bonds between carbon
molecules because they are saturated with hydrogen molecules.
-Fatty acid tails that have single carbon bonds. C-C
-Maximum number of hydrogen atoms.
-Linear shape of fatty acids allows them to stack easily.
-Solid at room temperature.
-Example:
oButter is solid at room temperature, but melts at a higher temperature.
oBacon grease is solid at room temperature, but melts at a higher temperature.
-Example of foods that contain saturated fat:
oLamb
oPork
oButter
oCheese
Fats
-Functions of fats:
oGreat source of energy (long-term energy storage)
oInsulation (if you are in cold water, you need insulation).
oCushion organs.
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