Structure and Properties of Peptides
The peptide bond in proteins is

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

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

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