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Structure and Properties of Peptides

Structure and Properties of Peptides
The heme is held in place by a bond between

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

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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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Structure and Properties of Peptides
Peptides in the fully extended chain conformation

do not occur in nature
have Y = F = 180°
also have a cis geometry in their peptide bonds
are equivalent to the (3-sheet structure

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

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

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

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

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

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