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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 reverse turn
the P-strand
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
peptide bonds
disulfide bridges
hydrogen bonds

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Structure and Properties of Peptides
Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Delta
Alfa
Gamma
Epsilon

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

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

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Structure and Properties of Peptides
Disulfide bonds most often stabilize the native structure of

intracellular proteins
hydrophobic proteins
extracellular proteins
dimeric proteins

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

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

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