Question: how many atoms are in a dna molecule?
Answer: Its pentose sugar has 15 atoms also (the 5-carbon sugar used for ribonucleic acid (RNA) is very similar, but it has an extra oxygen atom). The phosphate group contains 4 atoms. Total for a thymine nucleotide: 34 atoms. Multiply that by 6 billion nucleotides and you get 204 billion atoms.