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Structure and Properties of Peptides

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

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

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

dimeric proteins
extracellular proteins
intracellular proteins
hydrophobic proteins

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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
What was the first protein whose complete tertiary structure was determined?

Pancreatic ribonuclease
Lysozyme
Myoglobin
Pancreatic DNase

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

truly double bond
Van der waals force
Hydrogen bond
partial double bond

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

Increase affinity in muscle cell otherwise decrease
Decrease in oxygen affinity
No effect on oxygen affinity
Increase in oxygen affinity

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