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Structure and Properties of Peptides

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

Epsilon
Delta
Gamma
Alfa

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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
collagen
silk protein

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

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

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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 oxygen in hemoglobin and myoglobin is bound to

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

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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

hydrogen bonds
peptide bonds
phospho-diester bonds
disulfide bridges

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