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Structure and Properties of Peptides

Structure and Properties of Peptides
An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

fibrous proteins
silk protein
globular proteins
collagen

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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
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 nature of peptide bond can be best explained as

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

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

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

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

analogous to the steps in a spiral staircase
more numerous than Vander Waals interactions
not present at Phe residues
roughly parallel to the helix axis

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MORE MCQ ON Structure and Properties of Peptides

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