8. The group of enzymes able to relax supercoils in DNA is called (A) primases. (B) helicases. (C) topoisomerases. (D) telomerases.

1. The famous movies star, Angelina Jolie, has her breast and ovaries removed because she inherits a mutant version of BRCA1. Which biological process is affected in BRCA1 mutant so that she has high risk of cancer? (A) DNA synthesis. (B) RNA synthesis. (C) DNA repair. (D) protein synthesis.