Dand E are basic amino acids because at neutral pH they

donated a side-chain proton

K and R are considered basic because at neutral pH they have

accepted a side-chain proton

All amino acids are

polyprotic, weak acids

A peptide bond is formed in a condensation reaction between two

two amino acids

Which amino acids are the exceptions when it comes to Geometry and chirality?

Proline and Glycine

Which amino acids falls under nonpolar?

Leucine, Proline, Alanine, Methionine, Tryptophan, Phenylalanine, isoleucine and Valine

Which amino acids are considered polar?

Glycine, Serine, Asparagine, Glutamine, Threonine, Cysteine, and Tyrosine

which amino acids are considered acidic?

Aspartic acid and Glutamic acid

Which amino acids are considered basic?

Lysine, Arginine, and Histidine

At a neutral pH, the alpha amino group and alpha carboxyl group are

charged

If the pH is below the pKa

protonate

If pH is above the pKa

deprotonate

DEHCYKR:

D=3.9, E=4.1, H=6.0, C=8.4, Y=10.5, K=10.5, R= 12.5

All amino acids are chiral except:

glycine

Which amino acid configuration predominates?

L-amino aicds

Absorbance is at___ especially in Tyr and Trp.

280 nm

When a protein in floating freely in an aqueous solution, the

hydrophobic side will be inside the proteins and hydrophilic will be found on the outside of protein

When pH<pKa, it is

(+) charged

When pH>pKa, it is

(-) charged

Cysteine is the only amino acid that participates in

covalent reaction in proteins

leucine, Leu, L

Proline, Pro, P

Alanine, Ala, A

Valine, Val, V

Methionine, Met, M

Tryptophan, Try, W

Phenylalanine, Phe, F

Isoleucine, Ile, I

Glycine, Gly, G

Asparagine, Asn, N

Serine, Ser, S

Glutamine, Gln, Q

Threonine, Thr, T

Tyrosine, Tyr, Y

Cysteine, Cys, C

Aspartic acid, Asp, D

Glutamic acid, Glu, E

Lysine, Lys, K

Arginine, Arg, R

Histidine, His, H