Lipids opt 1
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    Lipids opt 1 Lipids opt 1 Presentation Transcript

    • AS Biology Core PrinciplesLipids 100’s of free ppt’s from library
    • Aimso Elements of lipidso Structure of glycerol & fatty acidso Condensation reactions to form triglycerideso Phospholipids
    • Introduction to lipids
    • Introduction to lipidso Lipids contain the elements carbon, hydrogen and oxygen.o They have numerous functions, primarily energy stores in animals and plants.o Lipids consist of two types of molecules - glycerol & fatty acids.
    • Glycerolo A molecule of glycerol is made up of three carbon atoms.o Each of these has a hydroxyl group attached to it.o Hydrogen atoms occupy the remaining positions.
    • Fatty Acids
    • Fatty Acidso A single fatty acid molecule contains an acid (COOH) group attached to a hydrocarbon chain.o Hydrocarbon usually denoted by the letter ’R’.o Saturated = If every carbon atom in the chain is joined by a single C-C bond.o Unsaturated = at least one C=C bond.o Polyunsaturated = many double bonds.o Most animal fats are saturated while most plant fats are unsaturated.
    • Triglycerides
    • Triglycerideso A triglyceride molecule is made of a glycerol molecule and three fatty acids.o The molecules join together through the process of condensation losing a molecule of water each time a link is made.o The link between the glycerol molecule & each fatty acid is an ‘Ester Link’.o The fatty acids in a lipid molecule can differ in length and can be saturated or unsaturated.
    • Triglycerides
    • Phospholipidso In phospholipids one of the fatty acids of a triglyceride is substituted by a phosphate group.
    • Phospholipids
    • Phospholipids
    • Lipids & watero Triglycerides and phospholipids have hydrophobic and hydrophilic groups. o What does this mean? o To what use is this feature put in biology?
    • More Infoo To make further notes on Lipids : o Pages 11 & 12 in Collins o Pages 69 - 71 Roberts o o o