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Structure and Properties of Peptides

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

One-tenth
Half
One-third
One-fourth

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

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

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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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?

Complete tertiary structure
Thermodynamic stability
Complete secondary structure
Complete quaternary structure

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:

Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
Val-Lys-Glu + Met-Ser-Trp-Arg-Ala
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala

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