Biology
Proteins
- Created by: Hebe Monks
- Created on: 21-09-14 15:51
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- Proteins
- Dipetide- Two amino acids
- Polypetide- More than two amino acids
- Protein- 1+ Polypeptide
- Amino acids are linked by condensation reactions.
- Water molecule realesed.
- Peptide bond formed.
- Biuret test:
- 1. Add sodium hydroxide (soloution needs to be alkaline).
- 2. Add copper sulphate.
- 3. Purple- Protein, Blue- No protein.
- Four Structual Levels:
- 1. Primary= Amino acids are joined in a long polypeptide chain.
- 2. Secondary= Hydrogen bonds form. This causes chain to coil (a-helix) or fold (Beta pleated sheet).
- 3. Tertiary= Coiled or folded chain, is coiled/folded further. More bonds form.
- 4. Quaternary= Different polypeptide chains can be joined together in the protein molecule.
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