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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 reverse turn
All of these
the P-strand
the a-helix

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

0.9
0.5
1.7
0.1

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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

peptide bonds
disulfide bridges
hydrogen bonds
phospho-diester bonds

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Structure and Properties of Peptides
In the β-pleated sheet

All of these
hydrogen bonds are formed between the peptide bonds
adjacent polypeptide chains can either be parallel or antiparallel
the polypeptide chain is fully extended

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

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

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

Lysozyme
Myoglobin
Pancreatic ribonuclease
Pancreatic DNase

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