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Structure and Properties of Peptides

Structure and Properties of Peptides
An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

fibrous proteins
silk protein
collagen
globular proteins

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

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

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Structure and Properties of Peptides
The major element of secondary structure in myoglobin and hemoglobin is

All of these
the reverse turn
the P-strand
the a-helix

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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?

C20H50O20N10
C20H40O10N10
C20H68O29N10
C20H32O11N10

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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
In the β-pleated sheet

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

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