Proteins Flashcards
What are the 5 classes of amino acids?
1)non-polar aliphatic
2)non-polar aromatic
3)polar uncharged
4)negatively charged
5)positively charged
What is the significance of non-polar?
Hydrophobic
What his the primary structure of proteins?
Sequence of polypeptides related by PEPTIDE bonds
What is the main bond of the secondary structure of protein?
Hydrogen bonds
What is the difference between alpha helix and beta pleated sheet?
Alpha helix:
-amino acid are all in the same direction
Beta pleated sheet:
-amino acids are oriented in different directions
What is the tertiary structure of protein?
H bonds salt bridges disulphide bridges van der Waals — between R groups
What are the type of reactions in the tertiary structure of protein?
Hydrophobic reactions
What is the quaternary structure of proteins?
H bonds salt bridges disulphide bridges van der Waals — R groups of DIFFERENT polypeptides
What the main concept of dénaturation of protein?
Unfolding them so they loses their functions
What is an exemple of a conditions that could cause the dénaturation of a protein?
-heat
-pH change
-ionic concentration
What can break down the quaternary structure of protein?
Dissociation
What is the principle of dehydration synthesis?
Monomers joined by removal of OH in the first monomer and removal of H in the second monomer.
What is the concept of hydrolysis?
Adding water to a polymer so the monomers are released
What are the key functions of proteins?
Everything in the cell is carried out by them
What is the monomer of proteins?
Amino acids
