Question

Cancer may result from the activation of __________________________ to____________________and/or the inactivation of ______________________genes.

Answer 1

The answer is proto-oncogenes, oncogenes, tumor-suppressor genes. The first group, called proto-oncogenes, produces protein products that usually improve cell division or prevent normal cell death. The mutated forms of these genes are called oncogenes. The second group, called tumor suppressors, makes proteins that generally prevent cell division or cause cell death.