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Structure and Properties of Peptides

Structure and Properties of Peptides
What is the proportion of glycine residues in collagenous regions?

Half
One-tenth
One-third
One-fourth

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

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

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

0.1
0.5
0.9
1.7

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

roughly parallel to the helix axis
analogous to the steps in a spiral staircase
more numerous than Vander Waals interactions
not present at Phe residues

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Structure and Properties of Peptides
The major element of secondary structure in myoglobin and hemoglobin is

the a-helix
the P-strand
the reverse turn
All of these

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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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