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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-fourth
One-third
One-tenth
Half

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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
negatively charged residues
positively charged residues

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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
Hydrogen bonds in a-helices are

roughly parallel to the helix axis
more numerous than Vander Waals interactions
analogous to the steps in a spiral staircase
not present at Phe residues

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

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

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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)
is stronger than an ordinary single bond
has partial double bond character
is still not completely understood

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