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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 a-helix
All of these
the P-strand
the reverse turn

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

Half
One-third
One-tenth
One-fourth

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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

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

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

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

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Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe3+ and cysteine
the Fe3+ and histidine
the Fe2+ and cysteine
the Fe2+ and histidine

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

Pancreatic ribonuclease
Myoglobin
Pancreatic DNase
Lysozyme

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