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Structure and Properties of Peptides

Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

An a-helix
A P-pleated sheet
A multimeric protein
A globular domain

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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 oxygen binding curves of hemoglobin and myoglobin

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

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Structure and Properties of Peptides
Disulfide bonds most often stabilize the native structure of

dimeric proteins
intracellular proteins
extracellular proteins
hydrophobic proteins

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

positively charged residues
negatively charged residues
hydrophobic residues
polar 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

globular proteins
silk protein
collagen
fibrous proteins

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