Small identical or similar molecules which can be joined together to make larger molecules (polymers).
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How is a dipeptide formed?
Via a condensation reaction when to amino acids join, to form a peptide bond.
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What bond is found within a dipeptide?
Peptide
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What groups are within an amino acid?
Amine group, variable group and a carboxyl group
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What is a polypeptide?
It is formed when more than 2 amino acids join together
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What is hydrolysis?
The addition of a water molecule to a dipeptide/polypeptide to break the peptide bond to create a monomer.
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Define primary structure
The number and sequence of amino acids in a polypeptide chain.
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What is a secondary structure?
When a polypeptide chain folds or coils into alpha helixes and beta pleated sheets.
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How is the secondary structure maintained?
Weak hydrogen bonds
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What is the tertiary structure?
Further folding/coiling of the polypeptide chain into a specific complex 3D shape.
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How is the the tertiary structure maintained?
Ionic bonds which form between the oppositely charged R groups. Disulphides bridges also form when cystine molecules containing sulphur come close together.
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What is the quaternary structure?
Several polypeptide chains held together. The structure is the way these chains are assembled together.
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What is the test for proteins?
Biuret test
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Describe the biruet test
1) Add an equal volume of sodium hydroxide to the solution. 2) Add a few drops of dilute copper || sulphate solution (0.05%)
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What is a positive result of a blurt test?
A colour change from blue to purple, due to the peptide bonds.
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Other cards in this set
Card 2
Front
How is a dipeptide formed?
Back
Via a condensation reaction when to amino acids join, to form a peptide bond.
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