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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

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

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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
Hydrogen bonds in a-helices are

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

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Structure and Properties of Peptides
In the β-pleated sheet

All of these
the polypeptide chain is fully extended
adjacent polypeptide chains can either be parallel or antiparallel
hydrogen bonds are formed between the peptide bonds

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

Van der waals force
Hydrogen bond
partial double bond
truly double bond

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

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

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