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

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Structure and Properties of Peptides
The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?

C20H50O20N10
C20H68O29N10
C20H32O11N10
C20H40O10N10

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

One-third
One-tenth
Half
One-fourth

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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
hydrogen bonds are formed between the peptide bonds
the polypeptide chain is fully extended

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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

silk protein
fibrous proteins
collagen
globular proteins

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

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

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