Exercise: Structure And Properties Of Peptides

Questions for: Structure And Properties Of Peptides

In deoxy hemoglobin (Hb), the Fe (II) is coordinated to
A:
four nitrogens of heme, the proximal His, and a water molecule
B:
four nitrogens of heme and to a water molecule
C:
two nitrogens of heme and to three His residues in Hb
D:
two nitrogens of heme and to three water molecules
Answer: A
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The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:
A:
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
B:
Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
C:
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
D:
Val-Lys-Glu + Met-Ser-Trp-Arg-Ala
Answer: C
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Which of the following is an example of tertiary structure in a protein?
A:
A multimeric protein
B:
An a-helix
C:
A P-pleated sheet
D:
A globular domain
Answer: D
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The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?
A:
C20H50O20N10
B:
C20H32O11N10
C:
C20H40O10N10
D:
C20H68O29N10
Answer: B
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The peptide bond in proteins is
A:
only found between proline residues
B:
usually cis unless proline is the next amino acid
C:
usually trans unless proline is the next amino acid
D:
is planar because of steric hinderance
Answer: C
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