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Structure and Properties of Peptides

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

extracellular proteins
hydrophobic proteins
intracellular proteins
dimeric proteins

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

Myoglobin
Lysozyme
Pancreatic DNase
Pancreatic ribonuclease

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

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

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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
are identical
allow maximum transfer of oxygen to the tissues

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

more numerous than Vander Waals interactions
not present at Phe residues
roughly parallel to the helix axis
analogous to the steps in a spiral staircase

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

Alpha
Gamma
Beta
Delta

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