FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 24: Amino Acids, Peptides, and Proteins

Show Answer

Share

---

All types

Filters

Study Flashcards

Question 31

Multiple Choice

Review LaterAdd Note

Review Later

Which amino acid has a phenol in its side chain?

A) tyrosine
B) tryptophan
C) isoleucine
D) asparagine
E) histidine

F) A) and B)
G) A) and E)

Correct Answer

verified

Show Answer

Question 32

Multiple Choice

Review LaterAdd Note

Review Later

Disulfide linkages can form between:

A) two cysteine residues.
B) two methionine residues.
C) a cysteine residue and a methionine residue.
D) two threonine residues.
E) a methionine residue and a threonine residue.

F) D) and E)
G) B) and E)

Correct Answer

verified

Show Answer

Question 33

Multiple Choice

Review LaterAdd Note

Which of the following amino acids has its isoelectric point at the highest pH?

Draw the structure of Lys-Phe-Leu at biological pH.

Provide the single letter code for the following peptide Arg-Phe-Tyr-Cys-Asp-Trp-Gln-Ala-Glu-Glu-His-Lys

Draw the Fischer projection of L-valine at a pH of 12.

Which amino acid has an amide group in its side chain?

Provide the structure of the major organic product which results when L-phenylalanine is treated with a large excess of PhCH₂OH and gaseous HCl.

When the structure of a small dipeptide was examined using NMR, it was observed that the carbonyl oxygen atoms in the backbone structure are nearly always trans with respect to the H atoms on the amide nitrogens. Explain this observation and include diagrams.

Provide the structure of L-aspartic acid at pH 12.0.

What name is given to a protein infectious agent that is thought to promote misfolding and polymerization of normal protein molecules and that is believed to cause Creutzfeldt-Jakob Disease?

Which amino acid has an imidazole ring in its side chain?

Draw structures for the forms of glycine present in basic, neutral, and acidic solutions.

Most naturally occurring amino acids are L-amino acids. Does this mean they are levorotatory? Explain.

The primary structure of a protein refers to:

What is the major end product of the following reaction series?

The H-bonds formed in the tertiary structure of proteins can be differentiated from those formed in secondary structures. What is the major distinguishing factor?

Before Edman degradation, Fredrick Sanger developed the first method to analyze the N-terminal amino acid of a protein using 2,4-dinitrofluorobenzene in the following reaction. Propose a mechanism for this reaction.

Which of the following amino acids has its isoelectric point at the lowest pH?

Provide a reasonable synthesis of PhCH₂CH(NH₃⁺)CO₂H from BrCH(CO₂CH₂CH₃)₂.