Read the short text and choose the correct answer.

Every nucleotide monomer consists of a five-carbon \(pentose\) sugar that is bonded to one of five nitrogen-containing bases and at least one phosphate group. These five nitrogen-containing bases are adenine, guanine, cytosine, thymine and uracil. Some of the bases \(cytosine, thymine, and uracil\) have a single ring made of carbon and nitrogen atoms. The other bases \(adenine and guanine\) have two such rings. The sequence of bases in DNA determines the sequence of amino acids in proteins. DNA, as we said above, is a nucleic acid that is found in genes.

What statement is false, according to the text?

• Thymine, cytosine, and uracil have a double ring made of carbon and nitrogen atoms.
• Every nucleotide monomer consists of a pentose sugar.
• Guanine and adenine have two rings made of carbon and nitrogen atoms.
• DNA is a nucleic acid.