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Structure and Properties of Peptides

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

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

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

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

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Structure and Properties of Peptides
In the β-pleated sheet

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

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

Half
One-fourth
One-third
One-tenth

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Structure and Properties of Peptides
The peptide bond in proteins is

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

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Structure and Properties of Peptides
Peptides in the fully extended chain conformation

have Y = F = 180°
are equivalent to the (3-sheet structure
do not occur in nature
also have a cis geometry in their peptide bonds

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MORE MCQ ON Structure and Properties of Peptides

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