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Structure and Properties of Peptides

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

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

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

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

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

negatively charged residues
polar residues
hydrophobic residues
positively 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

silk protein
globular proteins
fibrous proteins
collagen

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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, 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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