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Structure and Properties of Peptides

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

extracellular proteins
intracellular proteins
hydrophobic proteins
dimeric proteins

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

polar residues
negatively charged residues
hydrophobic residues
positively charged residues

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Structure and Properties of Peptides
Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Delta
Gamma
Alfa
Epsilon

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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 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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Structure and Properties of Peptides
The peptide bond in proteins is

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

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