Proteins Flashcards
What is the structure of an amino acid?
Amino group
Carbonyl group
Hydrogen atom
R group- variety of chemical groups
How is a peptide bond formed?
Condensation reaction
Where in an amino acid does a peptide bond form?
Between the carbon atom of one amino acid and the nitrogen atom of another
What is it called when many amino acid monomers join together?
Polymerisation
What is a polypeptide?
A chain of many hundred amino acids
What happens when a proteins shape changes?
It functions less well or differently
What bonds are formed in the secondary structure of proteins?
Weak hydrogen bonds
What shape is the structure of the secondary structure of proteins?
A-helix
What bonds in the tertiary structure are fairly strong and therefore not easily broken?
Disulfide bridges
What bonds in the tertiary structure are formed between any carboxyl and amino group?
Ionic bonds
Which is stronger- a disulfide bridge or ionic bonds?
Disulfide bridge
What bonds in the tertiary structure of a protein are numerous but easily broken?
Hydrogen bonds
Which proteins have a 3D structure?
Secondary, tertiary and quaternary
What is the structure of a quaternary protein?
Number of polypeptide chains linked in various ways
What is the test for proteins?
Biuret test
