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

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

1.7
0.9
0.5
0.1

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

roughly parallel to the helix axis
analogous to the steps in a spiral staircase
not present at Phe residues
more numerous than Vander Waals interactions

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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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

globular proteins
fibrous proteins
silk protein
collagen

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

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

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MORE MCQ ON Structure and Properties of Peptides

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