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

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

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

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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

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

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

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

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Structure and Properties of Peptides
An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

silk protein
fibrous proteins
globular proteins
collagen

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

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

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