amino acids + ion interactions Flashcards
1
Q
2 types of dipole + example
A
ion dipole interactions (metal ion + water)
dipole - dipole interactions (water on water)
2
Q
Features of hydrogen bonds
A
- weak intermolecular bonds
- LINEAR
- hydrogen atom and either O, N or F form a dipole
- polar molecules
3
Q
Amphipathic
A
having both hydrophilic and hydrophobic regions
4
Q
stereoisomers
A
- 2 compounds virtually identical but are non superimposable
5
Q
Read polypeptides in what way
A
from N (ammine) terminus to C (carboxyl) terminus
6
Q
features of peptide bonds
A
- covalent double bond
- planar
7
Q
features of pH scale
A
- log scale increase in 1 = ten fold increase
- measure of H+ ions
- H+ x OH- = 1x10^14
8
Q
pH calculations
A
pH= Log10 (H+)
pKa - pH = Log10( HA/A-)
HA= acid, A- = conjugate base
9
Q
Features of buffers
A
- weak acid + salt of a weak acid
- resist pH change within a system, keep pH within +- 1 of pKa value
10
Q
Zwitterion
A
amino acid with non charged R group
- has 2 titratable groups - N + C terminus
- 2 pKa values
11
Q
Isoeletric point
A
point at which the protein has a net pH of 0
- will precipitate out of solution
12
Q
4 types of amino acids + why
A
- basic
- acidic
- polar
- non polar
depends on R groups attached to alpha carbon (carbon joined to C + N terminus)
13
Q
bond between amino acids
A
- peptide bond
