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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 a-helix
the reverse turn
the P-strand

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

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

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

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

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Structure and Properties of Peptides
In the β-pleated sheet

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

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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

phospho-diester bonds
disulfide bridges
hydrogen bonds
peptide bonds

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

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

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