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Structure and Properties of Peptides

Structure and Properties of Peptides
What is the proportion of glycine residues in collagenous regions?

One-third
One-tenth
Half
One-fourth

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

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

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Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

polar residues
negatively charged residues
positively charged residues
hydrophobic residues

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Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

An a-helix
A multimeric protein
A P-pleated sheet
A globular domain

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

Pancreatic ribonuclease
Myoglobin
Lysozyme
Pancreatic DNase

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

No effect on oxygen affinity
Increase in oxygen affinity
Decrease in oxygen affinity
Increase affinity in muscle cell otherwise decrease

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