Why Are the BRCA1 and BRCA2 Genes Considered to Be

Multiple Choice

Why are the BRCA1 and BRCA2 genes considered to be tumor-suppressor genes?

A) They prevent infection by tumor viruses that cause cancer.
B) Their normal products participate in repair of DNA damage.
C) The mutant forms of either one of these prevent breast cancer.
D) They block penetration of breast cells by chemical carcinogens.