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11 Cards in this Set
- Front
- Back
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What are the monomers of proteins? |
Amino Acids (20 types) |
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What are dipeptides and polypeptides? |
Dipeptides are two amino acids joined together Polypeptides are more than two amino acids joined together |
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what are proteins made from? |
One or more polypeptides |
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What is the general structure of an amino acid? |
ADD PICTURE OF A STRUCTURE OF AN AMINO ACID
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How are dipeptides formed? |
Amino acids are joined together by condensation reaction to form dipeptides. A molecule of water is released and a peptide bond is formed as a result. |
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Define Primary structure |
The sequence of amino acids in the polypeptide chain. |
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Define Secondary structure |
Hydrogen bonds are formed between the amino acids in the chain causing the coiling(a -helix) or folding(b -pleated) of the polypeptide chain.
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Define tertiary structure |
Further coiling and foiling More bonds form including: H bond, Ionic bond and Disulphide bridges.
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Define quaternary structure |
The presence of more than one polypeptide |
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Whats the test for presence of proteins? |
Biuret test 1) add biuret to sample Positive = Purple Negative = Stays blue |
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What happens to a protein when exposed to high temperatures or a large changed in pH? |
The ionic and hydrogen bonds holding the proteins in its tertiary structure break. This changes the shape of the protein therefore it has denatured. The shape of the protein is important to its function so if its denatured, its lost its function. |
