🩷 3.1.4.1 General properties of proteins Flashcards
(16 cards)
What is the monomer of a protein?
An amino acid
How many amino acids are there ?
20
How do the amino acids differ?
They differ in their R group (side group)
What bond does a condensation reaction between 2 amino acids form?
A peptide bond
How is a dipeptide formed ?
A condensation reaction between two amino acids.
How is a polypeptide formed ?
A condensation reaction between many amino acids.
What can a functional protein contain?
one or more polypeptides
What is the primary structure?
This is the order/sequence of amino acids in a polypeptide chain.
What is the secondary structure?
This is where hydrogen bonds form causing the polypeptide chain to fold into alpha helixes and beta pleated sheets.
What is the tertiary structure?
This is where more folding occurs to give the protein its 3D shape. This is caused by more hydrogen bonds forming, but also ionic bonds and, if sulfur is present in the adjacent amino acids then disulfide bridges form.
What is the quaternary structure?
Where two or more polypeptide chain bonds together.
Do all proteins have a quaternary structure?
no
What is the quaternary structure often associated to?
prosthetics group
What is the test for proteins?
Add biuret solution to the test and a positive result will be blue to mauve/lilac
What does NH2 represent in an amino acid ?
The amine group
What does COOH represent in an amino acid ?
The carboxyl group
