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Structure and Properties of Peptides

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

the reverse turn
the P-strand
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?

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

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

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

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Structure and Properties of Peptides
An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

collagen
silk protein
globular proteins
fibrous proteins

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

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

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

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

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