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Structure and Properties of Peptides

Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

A multimeric protein
An a-helix
A globular domain
A P-pleated sheet

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

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

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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
fibrous proteins
globular proteins
silk protein

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
The different orders of protein structure are determined by all of the following bond types except

disulfide bridges
peptide bonds
hydrogen bonds
phospho-diester bonds

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

more numerous than Vander Waals interactions
roughly parallel to the helix axis
analogous to the steps in a spiral staircase
not present at Phe residues

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