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Structure and Properties of Peptides

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

dimeric proteins
hydrophobic proteins
extracellular proteins
intracellular proteins

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

Alfa
Gamma
Delta
Epsilon

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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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
not present at Phe residues
analogous to the steps in a spiral staircase

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

collagen
silk protein
globular proteins
fibrous proteins

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

One-third
One-fourth
Half
One-tenth

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