Protein structure Flashcards
1
Q
What type of polymers are polypeptides and proteins
A
2
Q
How is the shape of the protein held together?
A
- complex shapes
- hydorgen bonds
- as well as other intermolecular force
- as well as disulfide bridges
3
Q
Why is the shape of proteins important?
A
- vital to their functions
- enzymes and structural materials in living thing
4
Q
What does helical mean? WHy does a protein have this shape?
A
spiral
due to hydrogen bonds between molecules
5
Q
What is pleating?
A
another arrangement of a protein
protein ends up in a pleated sheet
parallel chains held together by hydrogen bonds
6
Q
What is wool?
A
- protein fibre
- with a helix
*
7
Q
Why is wool stretchy?
A
- held together by H-bonds which stretch and the fibre extends
- releasing the tension allows the hydorgen bonds to returns to their normal length and the fibre returns to its original shape
- however, washing at high temperatures can permanently break the H-bonds and a garment may permanently loose its shape
8
Q
Where does hydrogen bonding occur between amino acids?
A
C=O groups and -N-H groups
shown as C=O···H-N
9
Q
What other bonding is present between amino acids?
A
- ionic attracts
- between groups on the side chain of amino acids that contain ions
- sulfur-sulur bonds
- amino acid cysteine has a side chain with an -CH2SH
- under suitable oxidising conditions, two cysteine molecules may react to form a sulfur-sulfur bond that forms a bridge between the two molecules
- creates a double amino acid called cysteins
- aka disulfide bridge
