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Structure and Properties of Peptides

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

Alfa
Gamma
Epsilon
Delta

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Structure and Properties of Peptides
The peptide bond in proteins is

is planar because of steric hinderance
usually cis unless proline is the next amino acid
only found between proline residues
usually trans unless proline is the next amino acid

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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
The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?

C20H68O29N10
C20H50O20N10
C20H40O10N10
C20H32O11N10

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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 cysteine
the Fe2+ and cysteine
the Fe3+ and histidine

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

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

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