Unit 1 - Proteins

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Primary structure of proteins
The precise sequence of amino acids, joined by peptide bonds in the polypeptide chain.
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Secondary structure of proteins
Arrangement of a portion of the polypeptide chain in to regular structures (held together by hydrogen bonds) commonly known a – helix or B-pleated sheet.
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Tertiary structure of proteins
The 3D shape of the protein, held in place by weak bonds e.g. ionic/hydrogen, or by strong bonds e.g. disulphide bridges.
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Quatenary structure of proteins
Two or more polypeptide chains combined to for a complete protein. E.g. haemoglobin.
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What are essential amino acids?
Those amino acids that cannot be synthesised by the body, and so have to be taken in as part of a human’s diet.
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Test for protein
Biuret's test - (Copper sulphate + Sodium hyrdroxide). In the presence of protein turns from blue to mauve
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Roles of protein in the body
Enzymes – control metabolism Antibodies – fight infection Actin + myosin – bring about movement Collagen – imparts strength to tissues Keratin – a structural protein – skin/hair/nails Membrane – transport channels and antigens
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Card 2

Front

Secondary structure of proteins

Back

Arrangement of a portion of the polypeptide chain in to regular structures (held together by hydrogen bonds) commonly known a – helix or B-pleated sheet.

Card 3

Front

Tertiary structure of proteins

Back

Preview of the front of card 3

Card 4

Front

Quatenary structure of proteins

Back

Preview of the front of card 4

Card 5

Front

What are essential amino acids?

Back

Preview of the front of card 5
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