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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

positively charged residues
hydrophobic residues
polar residues
negatively charged residues

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Structure and Properties of Peptides
If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?

Complete secondary structure
Complete tertiary structure
Complete quaternary structure
Thermodynamic stability

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

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

truly double bond
Hydrogen bond
partial double bond
Van der waals force

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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
is planar because of steric hinderance
usually trans unless proline is the next amino acid

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Structure and Properties of Peptides
The different orders of protein structure are determined by all of the following bond types except

phospho-diester bonds
peptide bonds
disulfide bridges
hydrogen bonds

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