Question

Question 12: How is a cancerous cell different from a normal cell?

Class 12 - Biology - Human Health and Disease Page 164

Answer 1

Instead of growing only when stimulated by external signals, cancer cells stimulate their own growth.
They disable tumor-suppressor genes and ignore external signals ordering them to stop dividing.
They refuse to destroy themselves through apoptosis – the process of programmed cell death that rids the body of damaged and dangerous cells.
Unlike normal cells, which can divide a limited number of times, cancer cells can multiply indefinitely, and are said to be “immortal.”
They simulate the growth of new blood vessels (angiogenesis) to support tumors’ increasing size.
Cancer cells can break away from their site of origin, enabling them to invade surrounding local tissue and spread to distant parts of the body (metastasis).

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Answer 2

Answer:

normal cells have a property called contact inhibition which allows them to stop their growth by virtue of contact. cancer cells have seemed to lose this property.

they grow rapidly and fight for nutrition from other normal cells.