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Structure and Properties of Peptides

Structure and Properties of Peptides
The major element of secondary structure in myoglobin and hemoglobin is

the P-strand
the reverse turn
the a-helix
All of these

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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

phospho-diester bonds
hydrogen bonds
peptide bonds
disulfide bridges

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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
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

positively charged residues
polar residues
negatively charged residues
hydrophobic residues

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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

collagen
globular proteins
fibrous proteins
silk protein

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

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

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