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Structure and Properties of Peptides

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

hydrophobic proteins
dimeric proteins
intracellular proteins
extracellular proteins

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

Alfa
Delta
Epsilon
Gamma

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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
truly double bond
partial double bond

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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
allow maximum transfer of oxygen to the tissues
are identical

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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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Structure and Properties of Peptides
The peptide bond in proteins is

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

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