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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 P-strand
All of these
the reverse turn

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

Beta
Gamma
Alpha
Delta

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Pancreatic ribonuclease
Lysozyme
Myoglobin
Pancreatic DNase

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

Gamma
Delta
Alfa
Epsilon

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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

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

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

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

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