Proteins Flashcards
What monomers are proteins made from?
Amino acids
Draw the general structure for an amino acid:
Amino acid with H group, carboxyl group, amino group and R group
What reaction between 2 amino acids forms what type of bond?
A condensation reaction forms a peptide bond between 2 amino acids creating a dipeptide.
How are polypeptides formed?
The condensation of many amino acids.
What might a functional protein contain?
One or more polypeptides
What is the primary structure of a protein? And which bond maintains it?
The number, type and order of amino acids in a polypeptide chain. Maintained by peptide bonds.
What is the secondary structure of a protein? And which bond maintains it?
The bending and folding of a polypeptide chain into an alpha-helix or beta-pleated sheet. Maintained by hydrogen bonds.
What is the tertiary structure of a protein? And which bonds maintain it?
The bending and folding of a polypeptide chain to give a unique globular or fibrous shape. Maintained by hydrogen, ionic and disulfide bonds.
What is the quaternary structure of a protein? And which bonds maintain it?
The joining of 2 or more polypeptide chains and other groups to form the final protein. Maintained by hydrogen, ionic and disulfide bonds.
What dictates tertiary structure?
Primary structure
What dictates an enzyme’s active site?
Tertiary structure
How do you conduct the Bieuret test for proteins?
- Add a few drops of NaOH to sample
- Add Copper Sulfate solution
- If protein present, turns purple.
- No protein = blue.
How does haemoglobin’s shape determine it’s function?
Compact, soluble protein which makes it easy to transport and carry oxygen around the body.
How does collagen’s shape determine it’s function?
Has 3 polypeptide chains tightly coiled together to make it strong.
