Flashcards in Amino Acids Deck (41)
Linear heteropolymers of alpha amino acids.
Proteins only contain which type of amino acids?
L amino acids.
All amino acids are chiral except...
Nonpolar, aliphatic R group side chains
R side chain is an alkyl group.
Aromatic R group side chains
R side chain is an aromatic group.
Polar, uncharged R group side chains
Can form hydrogen bonds (have an oxygen or nitrogen). Cysteine can form disulfide bonds (has a sulfur).
Positively charged R groups
Long chains, contain positively charged amino groups. Histidine has N but forms a ring.
Negatively charged R groups
Have a deprotonated carboxyl group.
What are the essential amino acids?
Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine.
What are the conditionally non-essential amino acids?
Arginine, cystine, glutamine, glycine, proline, tyrosine.
What are the non-essential amino acids?
Alanine, asparagine, aspartate, glutamate and serine.
The carboxylic acid of an amino acid will be protonated at...
An acidic (low) pH. First to deprotonate.
The amino group of an amino acid will be deprotonated at...
A basic (high) pH. Last to deprotonate.
At a low pH, amino acids are...
At a high pH, amino acids are...
At the isoelectric point...
The amino acid is least soluble in water and does not migrate in an electric field.
Average molecule weight of an amino acid
How many nucleotides for one amino acid?