Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
For each feature, say whether it describes a benign tumour or a malignant tumour.
Normal cells stop dividing when they touch, which is contact inhibition. A malignant tumour invades and spreads by metastasis, and a benign tumour does not. After doublings, a tumour that grew from one cell has cells. Carcinogens may be physical, chemical or biological.
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Benign.
Step 2. (b) Malignant. The cells are carried by the blood.
Step 3. (c) Benign.
Step 4. (d) Malignant.
Step 5. (e) Malignant. This is metastasis.
Answer: (a) benign; (b) malignant; (c) benign; (d) malignant; (e) malignant.
Log in to join the discussion.
Loading…