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

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

0.5
0.9
1.7
0.1

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Structure and Properties of Peptides
The different orders of protein structure are determined by all of the following bond types except

phospho-diester bonds
peptide bonds
disulfide bridges
hydrogen bonds

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

dimeric proteins
intracellular proteins
hydrophobic proteins
extracellular proteins

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

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

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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
truly double bond
partial double bond

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