Cancer causing genes are called
transformation genes
tumor suppressor genes
oncogenes
mutated genes

The correct option is oncogenes

Explanation:

An oncogene is a gene that has mutated and contributes to the development of cancer. Oncogenes are resposible for the transformation of a normal cell into a malignant  one that will develop a certain type of cancer. Cancer cells are cells that are in uncontrolled mitosis. When a gene of this type undergoes a mutation (during cell division or because of external mutagens) and the activity of the protein it encodes is altered, it is called an oncogene.

In their normal non-mutated state, oncogenes are called proto-oncogenes. These play an important role in the regulation of cell division.

The mutant protein that an oncogene encodes may differ from the healthy version by a single aminoacid. But this simple alteration can radically change the function of the protein. The most common mutation, which causes cancer, occurs in the general ras.  

the backbone of the dna and rna compound is sugar phosphate.