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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
Epsilon
Delta
Gamma

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

extracellular proteins
intracellular proteins
dimeric proteins
hydrophobic proteins

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Lysozyme
Myoglobin
Pancreatic DNase
Pancreatic ribonuclease

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

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

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

truly double bond
Hydrogen bond
partial double bond
Van der waals force

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Structure and Properties of Peptides
Peptides in the fully extended chain conformation

are equivalent to the (3-sheet structure
have Y = F = 180°
do not occur in nature
also have a cis geometry in their peptide bonds

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