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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 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
What was the first protein whose complete tertiary structure was determined?

Myoglobin
Pancreatic ribonuclease
Pancreatic DNase
Lysozyme

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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

phospho-diester bonds
disulfide bridges
peptide bonds
hydrogen bonds

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Structure and Properties of Peptides
Peptides in the fully extended chain conformation

have Y = F = 180°
are equivalent to the (3-sheet structure
do not occur in nature
also have a cis geometry in their peptide bonds

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

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