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Structure and Properties of Peptides

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

Delta
Alfa
Epsilon
Gamma

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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
What was the first protein whose complete tertiary structure was determined?

Lysozyme
Pancreatic ribonuclease
Myoglobin
Pancreatic DNase

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

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

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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

disulfide bridges
phospho-diester bonds
peptide bonds
hydrogen bonds

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

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

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