Only one person has answered correctly. DNA is by far the largest organic polymer in existence. Nothing else comes close. Let’s take human chromosome 1 (the largest human chromosome but not the largest chromosome in nature) as an example: A chromosome is comprised of one continuous double stranded molecule of DNA. The two stands are held together by hydrogen bonding, so each single strand is its own distinct molecule. Chromosome 1 has 247,249,719 bases (each strand). Purines (adenine and guanine) have 5 carbon atoms. Pyrimidines (cytosine and thymine) have 4 carbon atoms. Ribose has 5 carbon atoms. Phosphate has no carbons (PO[sub]4[/sub][sup]-[/sup]) So, let’s use the average of the number of carbons found in purines and pyrimidines for each position in the DNA strand: 4.5 carbon atoms. Each position on the strand is comprised of a base (either purine or pyrimidine), a ribose and a phosphate. These three items together are called a “nucleotide”. Total carbons for each nucleotide (base + ribose + phosphate) is: 4.5 + 5 + 0 = 9.5 carbons. Multiply this by the number of nucleotides in chromosome 1........ 9.5 x 247,249,719 = 2,348,872,330 carbons!!!! My quick calculation of the complete formula for the DNA molecule in chr1 is: C[sub]2348872330[/sub]H[sub]2719746909[/sub]N[sub]741749157[/sub]O[sub]1483498314[/sub]P[sub]247249719[/sub] This may be a little off as I have taken averages for the composition of the four nitrogenous bases, but it will be pretty close.