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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-tenth
One-fourth
Half
One-third

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

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

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

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

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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

disulfide bridges
phospho-diester bonds
peptide bonds
hydrogen bonds

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Structure and Properties of Peptides
Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Alfa
Gamma
Epsilon
Delta

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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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