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Structure and Properties of Peptides

Structure and Properties of Peptides
An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

silk protein
collagen
fibrous proteins
globular proteins

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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

are identical
allow maximum transfer of oxygen to the tissues
both (a) and (b)
are a consequence of the quaternary structure of hemoglobin

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

both (a) and (b)
has partial double bond character
is still not completely understood
is stronger than an ordinary single bond

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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 peptide bond in proteins is

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

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Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

the nitrogen atoms on the heme
lysine residues in the protein
the iron atom in the heme group
histidine residues in the protein

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MORE MCQ ON Structure and Properties of Peptides

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