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

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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
hydrogen bonds
peptide bonds
phospho-diester bonds

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

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

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Structure and Properties of Peptides
Peptides in the fully extended chain conformation

are equivalent to the (3-sheet structure
have Y = F = 180°
also have a cis geometry in their peptide bonds
do not occur in nature

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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

fibrous proteins
globular proteins
silk protein
collagen

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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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