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Structure and Properties of Peptides

Structure and Properties of Peptides
Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Delta
Alfa
Epsilon
Gamma

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Structure and Properties of Peptides
If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?

Complete quaternary structure
Complete secondary structure
Thermodynamic stability
Complete tertiary structure

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Structure and Properties of Peptides
When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about

0.9
0.1
0.5
1.7

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

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

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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
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

both (a) and (b)
is still not completely understood
has partial double bond character
is stronger than an ordinary single bond

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