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Structure and Properties of Peptides

Structure and Properties of Peptides
What is the proportion of glycine residues in collagenous regions?

One-tenth
One-fourth
One-third
Half

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

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

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

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

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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

allow maximum transfer of oxygen to the tissues
are identical
both (a) and (b)
are a consequence of the quaternary structure of hemoglobin

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

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

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Structure and Properties of Peptides
Disulfide bonds most often stabilize the native structure of

hydrophobic proteins
extracellular proteins
intracellular proteins
dimeric proteins

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MORE MCQ ON Structure and Properties of Peptides

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