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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?

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

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

hydrophobic residues
positively charged residues
polar residues
negatively charged residues

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

0.1
1.7
0.9
0.5

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Structure and Properties of Peptides
Which of the three subunits of the G proteins binds GDP and GTP?

Beta
Gamma
Delta
Alpha

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

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

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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

silk protein
globular proteins
fibrous proteins
collagen

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