What are nucleobases?

A. harmful substances found in the environment

B. nitrogen molecules that create the DNA sequence

C. special and unique enzymes used in DNA replication

D. genetic information that is passed down to offspring

B

Explanation:

Nucleobases, also known as nitrogenous bases or often simply bases, are nitrogen-containing biological compounds that form nucleosides, which in turn are components of nucleotides, with all of these monomers constituting the basic building blocks of nucleic acids.