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Structure and Properties of Peptides

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

Alpha
Gamma
Delta
Beta

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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?

C20H32O11N10
C20H68O29N10
C20H50O20N10
C20H40O10N10

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

0.9
0.1
1.7
0.5

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Structure and Properties of Peptides
The different orders of protein structure are determined by all of the following bond types except

hydrogen bonds
peptide bonds
phospho-diester bonds
disulfide bridges

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

not present at Phe residues
roughly parallel to the helix axis
analogous to the steps in a spiral staircase
more numerous than Vander Waals interactions

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

partial double bond
Hydrogen bond
truly double bond
Van der waals force

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