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17 Cards in this Set
- Front
- Back
What are amino acids made from?
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Amino group
carboxylic acids |
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How many amino acids are there?
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20
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How are amino acids joined?
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Condensation reactions which produces a polypeptide
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The bond produced in the condensation reactions for joining amino acids?
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peptide bonds
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What is the primary structure of a polypeptide?
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The order of amino acids in a polypeptide
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What is the secondary structure of a polypeptide?
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Alpha helix and beta pleated sheet held together only by hydrogen bonds.
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What is the tertiary structure of a polypeptide?
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Final 3d structure, further coiling and folding. Contains hydrogen bonds, ionic bonds, disulfide bonds, hydrophobic and hydrophilic bonds.
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What is a quaternary structure of a protein?
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2 or more polypeptide chains interacting together to produce the final protein
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Features of a globular protein
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rolled up into a ball
usually soluble have metabolic roles example- haemoglobin |
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Features of a fibrous protein
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form fibres
insoluble structural examples- collagen |
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Collagen
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3 polypeptides make up collegen
each chain is coiled chains are then coiled around each other 35% glycine fibrous protein provides mechanical strength |
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Uses of collagen
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prevents high pressure bursting arteries
connects skeletal muscles to bones formed from collagen, reinforced with calcium |
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Haemoglobin
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soluble globular protein
transports oxygen in the blood 4 polypeptide binded (2 alpha, 2 beta) each polypeptide has a haem group containing iron. |
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Test of sugar
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Benedict's test
Brick red percipitate of sugar is present. if no remains blue |
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Test for starch
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Iodine test
Solution will turn blue/black if starch is present if not will remain a honey colour |
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Test of protein
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Biuret test
Solution will turn lilac if present Stay blue if not |
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Test of lipids
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If present a cloudy white emulsion will appear
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