Structure and Properties of Peptides
Secondary structure in protein refers to

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

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Structure and Properties of Peptides
Hemoglobin has quaternary structure and is made up of

two polypeptide chains, one α-chains and one β-chains
six polypeptide chains, two α-chains and four β-chains
five polypeptide chains, two α-chains and three β-chains
four polypeptide chains, two α-chains and two β-chains

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

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

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