The side chain of serine could interact with the side chain of ___ using a(n) _____. - ANSWER-Histidine;
Hydrogen Bond
At physiological pH, all amino acids have at least ____ charged groups. - ANSWER-2
When a peptide bond forms, a(n) ______ reacts with a carboxylate group. - ANSWER-Amine
Since ...
BCHM 307 Exam Questions| Already
Answered| GRADED A+
The side chain of serine could interact with the side chain of ___ using a(n) _____. - ANSWER-Histidine;
Hydrogen Bond
At physiological pH, all amino acids have at least ____ charged groups. - ANSWER-2
When a peptide bond forms, a(n) ______ reacts with a carboxylate group. - ANSWER-Amine
Since there are 20 standard amino acid, the number of possible linear polypeptides of length N can be
expressed as _____. - ANSWER-20^N
Which of the following amino acids has a nonpolar side chain? - ANSWER-Val
What level of protein structure is characterized by the amino acid sequence? - ANSWER-Primary
Which of the following amino acids has a thiol group in its side chain? - ANSWER-Cys
Salt bridges, Hydrogen bonds, hydrophobic interactions, and sulfide bonds are all involved in what level
of structure? - ANSWER-Quaternary
At a pH above its pKa, the phenolic group of tyrosine is __________. - ANSWER-deprotonated and
negatively charged
Disulfide bonds form between two residues of which amino acid? - ANSWER-Cys
At pH 3, how many charged groups are present in the pentapeptide Ala-Asp-His-Ser-Lys? - ANSWER-4
What is the C-terminal amino acid in the pentapeptide Val-Leu-Arg-Ser-Gly? - ANSWER-Gly
, The formation of a dipeptide from two amino acids requires ______. - ANSWER-Loss of H2O
If a protein underwent a mutation such that a Glu residue was changed to another amino acid, which of
the following amino acids would least likely result in a change in the overall structure of the protein? -
ANSWER-Asp
At a pH above its pKa, the R-group of Asp is ______. - ANSWER-Deprotonated and negatively charged
The predominant non-covalent interaction seen in alpha-helices and beta-sheets is______. - ANSWER-
Hydrogen bonds
Molecular chaperones assist proteins in the formation of _______. - ANSWER-Tertiary Structure
alpha-helices and beta-sheets comprise ______ structure - ANSWER-Secondary
What is most critical for maintaining the tertiary structure of a protein? - ANSWER-Hydrophobic
interactions
What level of protein structure is characterized by the three dimensional structure of an entire
polypeptide including all amino acid side chains? - ANSWER-Tertiary
What is the N-Terminal residue of the peptide AYSDG - ANSWER-Alanine
The amino acid _______ is commonly phosphorylated - ANSWER-Ser
At a pH above its pKa, the epsilon-amino group of lysine is ____. - ANSWER-Deprotonated and neutral
Which of the following amino acids has a positively charged side chain at pH 7.4? - ANSWER-Lys
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