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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
collagen
globular proteins
fibrous proteins

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Structure and Properties of Peptides
What is the proportion of glycine residues in collagenous regions?

One-third
Half
One-tenth
One-fourth

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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?

Thermodynamic stability
Complete quaternary structure
Complete secondary structure
Complete tertiary structure

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Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe2+ and cysteine
the Fe2+ and histidine
the Fe3+ and histidine
the Fe3+ and cysteine

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

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

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Structure and Properties of Peptides
In β-pleated sheet structures neighbouring

neighboring chains are connected by a-helices
chains lie in a flat plane
neighboring residues are hydrogen bonded
neighboring chains are hydrogen bonded

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