110DT Year 1 Exam Revision

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  • Created by: vdagnan
  • Created on: 17-04-14 14:09
What are fat/lipids made from
Carbon, hydrogen and oxygen
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What are the three types of lipids
Triglcerides, Phospholipids, sterols (cholesterol)
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Explain the structure of a triglyceride
One glycerol molecule with three fatty acids
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Explain the reaction of the ester bonds
Bonds form between the -OH group of the glycerol and the -COOH hroup of the fatty acid (esterification). A molecule of water is lost
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medium chain fatty acid?
6-12
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Long chain fatty acid?
>12
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One end of a fatty acid contains the -COOH acid group what is on the other end?
CH3 Methyl group
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What is a glycerol?
A 3 carbon alcohol
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Where are tryglcerides found?
Fats and oils in food
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What is the structure of a phospholipids?
Glcerol with two fatty acids and a phosphate group
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What are the functions of the phospholipids?
Keeps fat suspended in water, component of cell membranes, transport and emulsifiers
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What are the food sources of phospholipids?
Egg yolks, liver, soybeans, peanuts
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What are the functions of cholesterol?
Component of cell membranes, precurser to other substances (vit D, Sterol hormones, Bile salts
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What food is cholsterol found?
animal foods
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Trans fatty acids are usually a process of hydrogenisation but occur naturally inwhich animals?
Beef, lamb, Mutton
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Describe the structure of this fatty acid 20:4 n-6
20 carbon bonds, 4 double bonds and the first double bod is on the 6th carbon nearest the methyl end
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The n-3 or omega 3 family of unsaturated fatty acids are called?
Alphalinolenic acid
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n-6 or omega 6 family aer called?
Linoleic acid
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n-9 are called?
Oleic acid
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Which are the two 'essential' fatty acids
Linoleic Acid and Alpha-linolenic acid
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Why are these fatty acids essential?
because vertabrates are unable to synthesise these fatty acids as we lack the enzymes to introduce double bonds at n-3 and n-6 (It can only form double bonds after the 9th carbon)
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What fatty acid can be synthesised from Linoleic Acid (omega 6)?
Arachidonic acid
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What fatty acid can be synthesised from Alpha linolenic acid (omega 3)?
Eicosapentanoic acid (EPA) and Docosahexanoiv acid (DHA)
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Where can EPA and DPA be found?
In oily fish
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Name 6 good sources of linoleic acid (omega 6)
Meat, Eggs, Nuts (walnut, brasil nut, almond, peanut), seeds used for oil and spreads (corn, safflower, sunflower, soya, sesame, whatgerm, pumpkin, evening primrose oil)
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Name 6 good sources of Alpha Linolenic acid (Omega 3)
Darg green leafy vegetables, meat from grass fed ruminants, oils from nuts and seeds, (walnut, peanut, almond, soya, linseed, rapeseed and hemp seeds
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What is the COMA recommendation for total fat intake for adults?
no more than 35% of food energy
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What is the digestion enzyme in the small intestine?
Pancreatic lipase
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What are the carriers of fat in the blood called
Lipoproteins
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What are the four main types of lipoprotein?
Chylomicrons, Very low density lipoproteins, Low density lipoproteins and High density lipoproteins
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Other cards in this set

Card 2

Front

What are the three types of lipids

Back

Triglcerides, Phospholipids, sterols (cholesterol)

Card 3

Front

Explain the structure of a triglyceride

Back

Preview of the front of card 3

Card 4

Front

Explain the reaction of the ester bonds

Back

Preview of the front of card 4

Card 5

Front

medium chain fatty acid?

Back

Preview of the front of card 5
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