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Structure and Properties of Peptides

Structure and Properties of Peptides
What is the proportion of glycine residues in collagenous regions?

Half
One-tenth
One-third
One-fourth

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

1.7
0.5
0.1
0.9

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

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

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
In β-pleated sheet structures neighbouring

chains lie in a flat plane
neighboring chains are hydrogen bonded
neighboring chains are connected by a-helices
neighboring residues are hydrogen bonded

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

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

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