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Structure and Properties of Peptides

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

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

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

Gamma
Epsilon
Alfa
Delta

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

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

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

extracellular proteins
dimeric proteins
intracellular proteins
hydrophobic proteins

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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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Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe2+ and histidine
the Fe3+ and histidine
the Fe3+ and cysteine
the Fe2+ and cysteine

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