DNA is a nucleotide, which is made up of pentose sugar, nitrogenous bases, and phosphate backbone.
The adenine, guanine, cytosine, and thymine are the nitrogenous bases of the DNA.
What is DNA made up of?
- The purines and pyrimidines are the two types of nitrogenous bases. Adenine and Guanine are purines, whereas the pyrimidines are Cytosine and Thymine.
- The nitrogenous bases are bonded by hydrogen bonds to their complementary molecule, such that, guanine binds with cytosine by three hydrogen bonds.
- The sugar and phosphate groups make up the backbone of the DNA. The pentose sugar of the DNA binds with the nitrogenous bases.
Thus, the correct answer is Option B.
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