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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 Fe3+ and histidine
the Fe3+ and cysteine
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

peptide bonds
disulfide bridges
phospho-diester bonds
hydrogen bonds

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

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

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Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

positively charged residues
negatively charged residues
polar residues
hydrophobic residues

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

Increase affinity in muscle cell otherwise decrease
No effect on oxygen affinity
Increase in oxygen affinity
Decrease in oxygen affinity

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Structure and Properties of Peptides
The major element of secondary structure in myoglobin and hemoglobin is

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

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