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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 cysteine
the Fe2+ and histidine
the Fe3+ and histidine

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Structure and Properties of Peptides
In the β-pleated sheet

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

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

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

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

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

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

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

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Structure and Properties of Peptides
When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about

0.9
0.5
0.1
1.7

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