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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

globular proteins
silk protein
collagen
fibrous proteins

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

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

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

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

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

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

Epsilon
Gamma
Delta
Alfa

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Structure and Properties of Peptides
When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about

0.9
1.7
0.1
0.5

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