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Structure and Properties of Peptides

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

Delta
Epsilon
Gamma
Alfa

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Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

lysine residues in the protein
the iron atom in the heme group
the nitrogen atoms on the heme
histidine residues in the protein

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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Structure and Properties of Peptides
Which of the three subunits of the G proteins binds GDP and GTP?

Alpha
Gamma
Delta
Beta

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is stronger than an ordinary single bond
has partial double bond character
both (a) and (b)
is still not completely understood

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

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

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