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

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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
An a-helix
A globular domain

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is still not completely understood
has partial double bond character
both (a) and (b)
is stronger than an ordinary single bond

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

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

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Structure and Properties of Peptides
Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Alfa
Delta
Gamma
Epsilon

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Structure and Properties of Peptides
Which of the three subunits of the G proteins binds GDP and GTP?

Gamma
Delta
Beta
Alpha

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