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

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Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe3+ and histidine
the Fe2+ and cysteine
the Fe3+ and cysteine
the Fe2+ and histidine

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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
collagen
silk protein
fibrous proteins

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

Epsilon
Delta
Alfa
Gamma

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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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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

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

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