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Structure and Properties of Peptides

Structure and Properties of Peptides
Disulfide bonds most often stabilize the native structure of

extracellular proteins
intracellular proteins
dimeric proteins
hydrophobic proteins

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Structure and Properties of Peptides
In the β-pleated sheet

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

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

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

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

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

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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
fibrous proteins
collagen

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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MORE MCQ ON Structure and Properties of Peptides

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