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Structure and Properties of Peptides

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

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

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

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

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

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

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

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

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

0.9
1.7
0.5
0.1

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

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

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