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Structure and Properties of Peptides

Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

positively charged residues
polar residues
hydrophobic residues
negatively charged residues

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

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

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Structure and Properties of Peptides
The different orders of protein structure are determined by all of the following bond types except

peptide bonds
phospho-diester bonds
hydrogen bonds
disulfide bridges

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Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

A globular domain
A multimeric protein
A P-pleated sheet
An a-helix

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Structure and Properties of Peptides
The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin 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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Structure and Properties of Peptides
The peptide bond in proteins is

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

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