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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

silk protein
fibrous proteins
collagen
globular proteins

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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 is the proportion of glycine residues in collagenous regions?

One-third
Half
One-fourth
One-tenth

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is stronger than an ordinary single bond
both (a) and (b)
is still not completely understood
has partial double bond character

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Structure and Properties of Peptides
Which of the three subunits of the G proteins binds GDP and GTP?

Beta
Alpha
Delta
Gamma

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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?

Complete secondary structure
Thermodynamic stability
Complete tertiary structure
Complete quaternary structure

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