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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

fibrous proteins
globular proteins
collagen
silk protein

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Structure and Properties of Peptides
The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?

C20H40O10N10
C20H32O11N10
C20H50O20N10
C20H68O29N10

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

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

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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

has partial double bond character
both (a) and (b)
is stronger than an ordinary single bond
is still not completely understood

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Pancreatic ribonuclease
Pancreatic DNase
Lysozyme
Myoglobin

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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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