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Structure and Properties of Peptides

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

One-third
One-fourth
One-tenth
Half

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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

hydrogen bonds
phospho-diester bonds
peptide bonds
disulfide bridges

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Structure and Properties of Peptides
The peptide bond in proteins is

is planar because of steric hinderance
only found between proline residues
usually trans unless proline is the next amino acid
usually cis unless proline is the next amino acid

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is stronger than an ordinary single bond
is still not completely understood
both (a) and (b)
has partial double bond character

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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 oxygen in hemoglobin and myoglobin is bound to

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

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