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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
globular proteins
collagen
fibrous proteins

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

partial double bond
Van der waals force
Hydrogen bond
truly double bond

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

Delta
Beta
Gamma
Alpha

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Structure and Properties of Peptides
The peptide bond in proteins is

usually cis unless proline is the next amino acid
is planar because of steric hinderance
usually trans unless proline is the next amino acid
only found between proline residues

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
Which of the following is an example of tertiary structure in a protein?

An a-helix
A globular domain
A P-pleated sheet
A multimeric protein

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