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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

positively charged residues
hydrophobic residues
negatively charged residues
polar residues

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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
C20H50O20N10
C20H68O29N10
C20H32O11N10

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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
When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about

0.1
0.5
1.7
0.9

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

Lysozyme
Pancreatic ribonuclease
Myoglobin
Pancreatic DNase

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

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

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