Multiple Choice
How do the pKa values of an ionizable side chain compare when the amino acid is free versus when it is in a polypeptide chain?
A) The pKa of the side chain is independent of whether the amino acid is in a polypeptide chain or is free.
B) The pKa of the side chain is always lower for the free amino acid.
C) The pKa of the side chain may be lower or higher in a polypeptide chain due to weaker inductive effects and differences in their microenvironments.
D) The pKa of the side chain is usually higher in a polypeptide chain due to stabilization from nearby residues in the three-dimensional structure.
Correct Answer:
Verified
Correct Answer:
Verified
Q45: All 20 common amino acids exist in
Q46: Most proteins contain an approximately equal amount
Q47: Which will react with amino acids to
Q48: The isoelectric point of amino acids is
Q49: Match the following to their functions.<br>-Regulates mammalian
Q51: A protein that contains more isoleucine,phenylalanine and
Q52: An amino acid named for a plant
Q53: In the amino acid analysis the PTC-amino
Q54: Which technique is most sensitive and accurate
Q55: Which is used to hydrolyze the peptide