DNA is a linear polymer composed of nucleotides. Nucleotides are made of a phosphate group, a sugar, and a base. The correct option is B. Sulfur. There is no sulfur in DNA molecules.
DNA
- Nucleic acids, such as DNA, are linear polymers composed of nucleotides joined by their extremes.
- The nucleotidic sequence codifies or specifies the genetic instructions to the correct development and functioning of the organism.
- DNA molecule keeps the information about the sequence of amino acids in the protein.
Nucleotides
Nucleotides are monomers composed of a sugar molecule, joined with a phosphate group and a nitrogenated base.
Nitrogenated Bases
• Nitrogenated bases are molecules carrying nitrogen and exhibiting the chemical properties of a base.
• DNA bases are adenine, guanine, cytosine, and thymine
Sugar group
• DNA sugar group contains deoxyribose, with hydroxyl modifications.
• Sugar is always a pentose.
Option B is the expection among the options. There is no sulfur in the DNA molecule.
In the attached files, you will find an image of a nucleotide. So you can see that per nucleotide, there is only one nitrogenated base, one phosphate group, and one sugar.
You can learn more about nucleotides at
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