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Structure and Properties of Peptides

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

polar residues
negatively charged residues
positively charged residues
hydrophobic residues

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

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

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

Decrease in oxygen affinity
No effect on oxygen affinity
Increase in oxygen affinity
Increase affinity in muscle cell otherwise decrease

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

Gamma
Alpha
Delta
Beta

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

0.5
0.9
1.7
0.1

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

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

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