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Structure and Properties of Peptides

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

Delta
Gamma
Alfa
Epsilon

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Structure and Properties of Peptides
In the β-pleated sheet

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

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

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

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Structure and Properties of Peptides
In β-pleated sheet structures neighbouring

neighboring chains are connected by a-helices
chains lie in a flat plane
neighboring residues are hydrogen bonded
neighboring chains are hydrogen bonded

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

Gamma
Beta
Alpha
Delta

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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
lysine residues in the protein
the iron atom in the heme group

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