Nutrition

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Author:
Cala3
ID:
78267
Filename:
Nutrition
Updated:
2011-04-08 05:26:08
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Nutrition
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Nutrition
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  1. What is ‘a family of compounds that includes Triglycerides (fats & oils) phospholipids (lecithin) & sterols (cholesterol)’ classified as?

    A) Lipids
    B) Oils
    C) Fats
    A) Lipids
    (this multiple choice question has been scrambled)
  2. What are fatty acids?
    chains of carbon atoms with an acid group at one end & hydrogen atoms attached to the carbon atoms
  3. Explain triglycerides? Give 3 facts about triglycerides.
    The major class of dietary lipids. Made up of units known as Fatty Acids & glycerol.

    • They provide protection, insulation & energy
    • They may be either solids or liquids
    • Any excess CHO, fats, proteins and oil will be stored as triglycerides
  4. Explain glycerol
    An organic compound that serves as the backbone for triglycerides
  5. Explain what a fatty acid is & the structure
    • - It is a chain of carbon atoms with hydrogen attached
    • it has an acid group at one end and a methyl group at the other
    • - The tail is a hydrophobic
    • - The head is a hydrophilic
  6. Name the 3 types of fatty acids
    • -Saturated, mono-unsaturated & polyunsaturated
    • -These refer to the number of hydrogen bonds attached to the hydrogen carbon tail
  7. Explain Saturated Fatty Acids & where they are found (4 points)
    • Fats
    • They contain the maximum number of hydrogen atoms.
    • They have all single bonds between the carbons.
    • Solid at room temperature
  8. Explain Unsaturated fatty acids (4 points)
    • -Oils
    • -Contain double bonds between carbons causing kinks in the molecule shape
    • -Liquid at room temperature
    • -2 types - Monounsaturated & polyunsaturated (2 or more points of unsaturation)
  9. What 2 fatty acids can the body not make?
    Linoleic (omega 6) & linolenic acids (omega 3)
  10. How many carbon atoms from the end of the chain, is the double bond in a Linoleic acid?
    6
  11. What 2 types of acids do Linolenic Acid produce?
    EPA & DHA
  12. When are Trans Fatty Acids formed?
    when liquid oils are made into solid fats (partial hydrogenation)
  13. Explain the process of hydrogenation & the 2 things that result
    -Plant oils are exposed to hydrogen at high temperature with a catalyst

    • -Some double bonds become single bonds
    • -Other double bonds are converted from CIS to trans configuration
  14. Do trans fats lower LDL cholesterol or HDL cholesterol?
    HDL

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