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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 P-strand
the reverse turn

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Structure and Properties of Peptides
The peptide bond in proteins is

usually trans unless proline is the next amino acid
usually cis unless proline is the next amino acid
is planar because of steric hinderance
only found between proline residues

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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
peptide bonds
hydrogen bonds

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

Gamma
Epsilon
Alfa
Delta

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

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

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

1.7
0.5
0.9
0.1

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