amino acids, peptides, and proteins Flashcards
which amino acid can be exchanged for methionine
Ile
which amino acid is often found at/ nonpolar boundaries
tryptophan
is methionine aliphatic
no
what is the mass in Daltons of glycine
75 daltons as a free amino acid
57 as a residue
how does cysteine become cystine
oxidizing environments extracellular or lumen
loses 2 Hs and 2 electrons
where would you not expect to find cystine
oxygen transport proteins
which uncommon amino acid is most used in labs
selenomethionine
which amino acids are incorporated during polypeptide synthesis
selenocysteine, selenomethionine, pyrollysine etc
O-phosphoserine for example is created before or after incorporation into a polypeptide
after
where are ornithine citrulline used
arginine biosynthesis and urea cycle
which amino acid is ornithine similar to
lysine
when ph is greater than pka is there more acid or base?
base
what is the percent of protonation of histidine at ph 7
10 `
how do nearby (+) charges affect pka
lower
