Biological Molecules

Question 1

Describe two ways in which the structure of DNA differs from the structure of collagen

Answer 1

DNA:

• 4 different monomers
• monomers = nucleotides
• double helix
• right handed helix
• loose helix
• sugar
• phosphate
• phosphodiester bonds
• anti parallel strands

Collagen

• more than 4 monomers
• monomers = amino acids
• triple helix
• left handed helix
• tightly coiled
• no sugar
• no phosphate
• no bases
• peptide bonds
• strands not antiparallel