That statement is almost correct. There are five main types of nucleotide bases found in living things, but two of them are only found in DNA, and two are only found in RNA. Here's the breakdown:

DNA bases:

* Adenine (A)

* Guanine (G)

* Cytosine (C)

* Thymine (T)

RNA bases:

* Adenine (A)

* Guanine (G)

* Cytosine (C)

* Uracil (U)

So, while there are five total bases, they are not all found in both DNA and RNA.