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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

globular proteins
fibrous proteins
silk protein
collagen

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Pancreatic DNase
Myoglobin
Pancreatic ribonuclease
Lysozyme

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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
Peptides in the fully extended chain conformation

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

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Structure and Properties of Peptides
In the β-pleated sheet

adjacent polypeptide chains can either be parallel or antiparallel
the polypeptide chain is fully extended
All of these
hydrogen bonds are formed between the peptide bonds

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

No effect on oxygen affinity
Decrease in oxygen affinity
Increase affinity in muscle cell otherwise decrease
Increase in oxygen affinity

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