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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
globular proteins
collagen

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Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

hydrophobic residues
negatively charged residues
positively charged residues
polar residues

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

histidine residues in the protein
lysine residues in the protein
the nitrogen atoms on the heme
the iron atom in the heme group

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

Delta
Alpha
Gamma
Beta

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Structure and Properties of Peptides
The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?

C20H68O29N10
C20H50O20N10
C20H32O11N10
C20H40O10N10

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