Amino Acids Flashcards
the amino acids most commonly found in nature are termed…
alpha amino acids
which amino acid is the only achiral member of the 20 common amino acids?
and what do the others all exist as?
glycine
L-optical form
what amino acids do bacteria have in their outer coat?
D amino acids
which amino acids are hydrophobic?
- valine
- leucine
- methionine
which amino acids are hard to differentiate and why?
- leucine
- isoleucine
have same mr
…. is the only secondary amino acid
proline
threonine is more… than serine?
hydrophobic
what 2 amino acids are homologues of each other?
asparagine + glutamine
how does tryptophan absorb light better than tyrosine?
has a more extended aromatic system
how many amino acids do oligopeptides contain?
2-10
how many amino acids do polypeptides contain?
10-50
how many residues do proteins usually contain?
50-400 residues
what does aspartame split into?
aspartic acid + phenylalanine
peptide bonds have strong..
resonance
for most peptides what does the delocalisation energy stabilise the molecule by?
75-90 kJ/mol
