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Structure and Properties of Peptides

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

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

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Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

negatively charged residues
hydrophobic residues
positively charged residues
polar residues

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

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

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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

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

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

0.5
1.7
0.1
0.9

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

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

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