Proteins Flashcards
1
Q
Elements
A
- C
- H
- O
- N
2
Q
R group
A
- could contain other elements
- sulphur - covalent bonding, strong, enzymes
- phosphorus
- iron - RBC
- molecule variety
- 20 amino acids in total
3
Q
Amino acids
A
- methionine = start codon
- cysteine = disulfide bridge = H-S-S-H very strong
4
Q
Structure
A
- amino group = H-N-H
- R group = R-C-H
- Carboxyl group = O=C-OH
5
Q
dipeptide
A
- condensation reaction
- peptide bond
6
Q
Primary organisation
A
- straight chain
- peptide bonds
7
Q
Secondary organisation
A
- alpha helix
- beta pleated sheet
- peptide bonds
- disulfide bonds
8
Q
Tertiary organisation
A
- peptide bond
- hydrogen bonds
- ionic interaction
- disulfide bridge
9
Q
quatemary
A
- more than 1 polypeptide chain
- peptide bond
- hydrogen bond
- ionic interaction
- disulfide bond
10
Q
fibrous
A
- long and narrow
- structural
- repetitive amino acid sequence
- less sensitive to changes in pH, temperature etc
- collagen, myosin, fibrin
- insoluble in water
11
Q
globular
A
- round / spherical
- functional
- irregular AA sequence
- more sensitive to changes
- enzymes, haemoglobin
- soluble in water
12
Q
buirtet test for protiens
A
- test solution needs to be alkaline so add few drops of sodium hydroxide
- ad biuret solution
- turns blue to purple
