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

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