What are the building blocks of DNA And RNA

Building blocks of DNA and RNA are nucleotides.

Specifically, DNA has 4 nucleotides: Adenine, Cytosine, Guanine, and Thymine.

And RNA has almost the same except one. Here are RNA nucleotides: Uracil, Cytosine, Guanine, and Adenine. (*Uracil instead of Thymine.)

The basic building block of DNA and RNA are Nucleotides.