Question

13. Which of these statements is TRUE? a. Cancer cells usually have more than one mutation. . Proto-oncogenes are normal genes that code for proteins that cause cells to undergo apoptosis (programmed cell death) c. Cancer usually involves a gain-of-function mutation in a tumor suppressor gene d. Cancer usually involves a loss-of-function mutation proto-oncogene

Answer 1

Answer - the correct answer is option (a)

Cancer cells usually have more than one mutation. Cancer is caused by more than one mutation which results in uncontrolled development of cells.

Explanation to other options

Proto oncogenes are normal genes which when altered by mutation become oncogene which causes cancer.these genes code for proteins that helps in regulation of cell division and they regulate apoptosis.

Cancer usually involves loss of funtfunc mutation in tumor suppressor gene.tumour suppressor genes are normally involved in the inhibition of cell growth and proliferation.