1) The monomers in DNA are deoxyribonucleotides but the monomers of alpha-helix are amino acids.
2) The bonds between monomers in DNA are phosphodiester bonds whereas the bonding between monomers in alpha-helix are peptide bonds.
3) There are only 4 types of monomers in DNA, but 20 possible monomers in alpha-helix.
4) DNA is a double helical structure while alpha-helix is made of single helical structure.
5) Intermolecular hydrogen bonding and hydrophobic interaction between stacked bases stabilise the 3-dimensional structure in DNA, but only intramolecular hydrogen bonding stabilise the structure of the alpha-helix.
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