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Structure and Properties of Peptides

Structure and Properties of Peptides
The major element of secondary structure in myoglobin and hemoglobin is

the reverse turn
the a-helix
the P-strand
All of these

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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

fibrous proteins
silk protein
collagen
globular proteins

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Structure and Properties of Peptides
What is the proportion of glycine residues in collagenous regions?

One-third
Half
One-tenth
One-fourth

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

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

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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
Disulfide bonds most often stabilize the native structure of

dimeric proteins
hydrophobic proteins
intracellular proteins
extracellular proteins

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