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17 Cards in this Set

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