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Structure and Properties of Peptides

Structure and Properties of Peptides
Disulfide bonds most often stabilize the native structure of

hydrophobic proteins
intracellular proteins
dimeric proteins
extracellular proteins

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Structure and Properties of Peptides
In β-pleated sheet structures neighbouring

neighboring residues are hydrogen bonded
neighboring chains are hydrogen bonded
neighboring chains are connected by a-helices
chains lie in a flat plane

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Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

A globular domain
A multimeric protein
An a-helix
A P-pleated sheet

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Structure and Properties of Peptides
The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:

Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
Val-Lys-Glu + Met-Ser-Trp-Arg-Ala

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Structure and Properties of Peptides
Which of the three subunits of the G proteins binds GDP and GTP?

Alpha
Beta
Gamma
Delta

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Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

lysine residues in the protein
histidine residues in the protein
the iron atom in the heme group
the nitrogen atoms on the heme

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