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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
polar residues
negatively charged residues
hydrophobic residues

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Myoglobin
Pancreatic ribonuclease
Pancreatic DNase
Lysozyme

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Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

A P-pleated sheet
An a-helix
A globular domain
A multimeric protein

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

Thermodynamic stability
Complete secondary structure
Complete tertiary structure
Complete quaternary structure

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Structure and Properties of Peptides
The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce

Val-Lys-Glu-Met-Ser + Trp-Arg-Ala.
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala.
Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala.

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