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Structure and Properties of Peptides

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

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

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Structure and Properties of Peptides
If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?

Complete secondary structure
Thermodynamic stability
Complete quaternary structure
Complete tertiary structure

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

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

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

One-tenth
Half
One-third
One-fourth

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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
In the β-pleated sheet

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

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