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

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

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Structure and Properties of Peptides
The Ramachandran Plot illustrates the fact that

the F & Y angles can assume approximately three different values
the F & Y angles can assume any value in a peptide
the peptide bond is planar
the F & Y angles can assume only a single value in a protein

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Structure and Properties of Peptides
Secondary structure in protein refers to

protein made up of more than one polypeptide chain
linear sequence of amino acids joined together by peptide bond
three dimensional arrangement of all amino acids in polypeptide chain
regular folding of regions of the polypeptide chain

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