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Structure and Properties of Peptides

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

hydrophobic proteins
dimeric proteins
extracellular proteins
intracellular proteins

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

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

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

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

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Structure and Properties of Peptides
If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?

Thermodynamic stability
Complete tertiary structure
Complete secondary structure
Complete quaternary structure

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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Structure and Properties of Peptides
In the β-pleated sheet

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

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