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Structure and Properties of Peptides

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

polar residues
hydrophobic residues
positively charged residues
negatively charged residues

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

Gamma
Beta
Delta
Alpha

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Structure and Properties of Peptides
The heme is held in place by a bond between

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

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

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

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

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

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Structure and Properties of Peptides
The peptide bond in proteins is

usually cis unless proline is the next amino acid
only found between proline residues
usually trans unless proline is the next amino acid
is planar because of steric hinderance

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