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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
All of these
the a-helix

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

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

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

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

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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

are identical
are a consequence of the quaternary structure of hemoglobin
allow maximum transfer of oxygen to the tissues
both (a) and (b)

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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