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11947018
Proteins
Description
'A level' AQA Biology Protein Topic
No tags specified
biology
section 1
a2
Mind Map by
Dominic Weston
, updated more than 1 year ago
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Created by
Dominic Weston
over 6 years ago
141
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Resource summary
Proteins
Proteins have many specialised structures to help in their functions
Antibodies
Enzymes
Transport Proteins
Structural Proteins
Food Testing for Proteins
Biuret Test
Add sodium hydroxide to make solution akali
Add Copper(II) sulfate solution
Purple is positive protein result
Negative result will cause the solution to remain blue
Proteins are made up of one or more polypeptides
Monomer of proteins are amino acids
Dipeptide formed from two amino acids joined
Polypeptides are formed when more than two amino acids are joined
Amino acids are joined by condensation reactions
Water molecule 'released' during reaction
Peptide bonds are formed between amino acids
Hydrolysis is the reverse reaction
Proteins have four structural levels
Quaternary
Several polypeptide chains bonded together
Final 3D structure
Primary
Sequence of amino acids forming a polypeptide chain
Secondary
Polypeptide chain begins to coil into a alpha helix or a beta pleated sheet
Because of hydrogen bonding within the chain
Tertiary
The folding from the secondary structure causes more bonding to different parts of the chain
More hydrogen bonds form, ionic bonds start
Final structure for single polypeptides
Disulfide bridges form between 2 molecules of the amino acid crysteine
Media attachments
Amino Acids1 (binary/octet-stream)
Protein Structure (binary/octet-stream)
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