Topic 2 lipids and proteins
- Created by: LauraNannini
- Created on: 15-04-20 10:17
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- Topic 2
- Lipids
- Molecular arrangement
- 'R' is the specific carbon tail
- Saturated fat
- Carbon 4 bonds
- Unsaturated fat
- Carbon bonded under 4 times
- Triglyceride
- a glycerol with three fatty acids on it connected by ester bonds
- Unsaturated triglyceride
- 1 fatty acid has to be unsaturated
- Polyunsaturated triglyceride
- 2 or 3 unsaturated fatty acids
- Properties
- Releases energy when oxidized
- Found in animal adipos tissue
- Low density
- Found in plant seeds
- No overall charge and insoluble in water
- Glycerol
- Test for Lipids
- 1. Shake substance in ethanol 2. Pour ethanol into water 3.droplets will form in water if lipids are present and water turns cloudy
- Phospholipid Structure
- Triglyceride structure
- Molecular arrangement
- Proteins
- Alpha helix- coiled structure
- Beta pleated structure- Folded structure
- Structures
- Primary- The amino acid sequence
- Secondary- Coiling or pleating
- Tertiary- 3D model to determine function
- Quaternary- more than one polypeptide
- Globular- spherical shape
- Fibrous protein- Long and thin
- Test for proteins
- 1. Add a biuret reagent and mix 2. if present it turns purple
- Dipeptides
- Two amino acids join through condensation reaction
- Lipids
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