3.8.2.3 - CANCER

Question 1

the KRAS gene codes for a protein called K-Ras. the protein relays signals from outside a cell to a cell’s nucleus, stimulating cell division. an alteration in the KRAS gene produces an oncogene which can cause a tumour to develop.

suggest and explain how an alteration in the KRAS gene can cause a tumour to develop (3)

Answer 1

1. mutation in KRAS gene OR change in base sequence of KRAS base sequence
2. change in protein produces
3. results in rapid uncontrollable cell division