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Protein
Very long chain in amino acids join together by peptide bonds and folded into a particular shape to carry out its function
Roles of protein
Structural; keratin in hair Metabolic; enzymes Other roles; antibodies, haemoglobin, chlorophyll, insulin, collagen
Shapes for protein
Globular, Fibrous
Test for proteins
Add biuret solution (NaOH+CuSO4) mix, blue to purple is positive
Note 
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