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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?

Delta
Beta
Gamma
Alpha

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Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

lysine residues in the protein
histidine residues in the protein
the iron atom in the heme group
the nitrogen atoms on the heme

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

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

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

both (a) and (b)
is stronger than an ordinary single bond
is still not completely understood
has partial double bond character

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

1.7
0.5
0.9
0.1

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Structure and Properties of Peptides
In the β-pleated sheet

adjacent polypeptide chains can either be parallel or antiparallel
All of these
the polypeptide chain is fully extended
hydrogen bonds are formed between the peptide bonds

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