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Structure and Properties of Peptides

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

Alfa
Gamma
Epsilon
Delta

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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

both (a) and (b)
are identical
are a consequence of the quaternary structure of hemoglobin
allow maximum transfer of oxygen to the tissues

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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 heme is held in place by a bond between

the Fe3+ and histidine
the Fe3+ and cysteine
the Fe2+ and histidine
the Fe2+ and cysteine

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

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

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

0.9
1.7
0.1
0.5

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