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Structure and Properties of Peptides

Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe2+ and histidine
the Fe3+ and cysteine
the Fe3+ and histidine
the Fe2+ and cysteine

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Structure and Properties of Peptides
In the β-pleated sheet

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

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

hydrophobic residues
polar residues
positively charged residues
negatively charged residues

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

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

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