Biological molecules - Proteins
- Created by: Molly04!
- Created on: 26-12-21 17:08
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- proteins
- Types of protein
- globular proteins - enzymes or hormones and structural proteins such as keratin or collagen.
- GLOBULAR PROTEINS water soluble and arranged in sphere hydrophobic amino acids are protected in middle
- globular proteins - enzymes or hormones and structural proteins such as keratin or collagen.
- How are proteins formed?
- Protein synthesis - amino acids undergo condensation reactions to form a polypeptide chain. code of amino acids is determined by the genetic code
- peptide bonds form to produce dipeptides and polypeptides
- structures of protein
- primary structure - this is the polypeptide of amino acids
- secondary structure - folding and coiling of polypeptide into alpha helices and beta pleated sheets. both are held together by hydrogen bonds
- Different types of bonds are formed to keep protein structures in shape: hydrogen bonds - the weakest; ionic bonds between charged r groups and disulphide bonds between sulphur containing r groups
- tertiary structure - the firth folding and coiling of the polypeptide chain
- quaternary structure - multiple polypeptide chains joined together
- made from carbon hydrogen, oxygen, nitrogen and sulphur
- Biuret test for proteins Biuret solution
- Biuret reagent is added to sample and is heated in water bath blue>purple
- function of proteins
- primary structure determines the function. if the pimary structure is altered it changes the functio
- Types of protein
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