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Question
How is a cancerous cell different from a normal cell?
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Solution
| Normal cell | Cancerous cell | |
| 1. | Normal cells show the property of contact inhibition. Therefore, when these cells come into contact with other cells, they stop dividing. | Cancerous cells lack the property of contact inhibition. Therefore, they continue to divide, thereby forming a mass of cells. |
| 2. | They undergo differentiation after attaining a specific growth stage. | They do not undergo differentiation. |
| 3. | These cells remain confined at a particular location. | These cells do not remain confined to a particular location. They invade neighbouring tissues and disrupt their function. |
| 4. | Dividing cells remain confined to the part of the body where they are formed. | These cells show metastasis, i.e., they have the ability to invade new sites. |
| 5. | Cells require extracellular growth factors. | These do not require extracellular growth factors. |
| 6. | Tumours are not formed. | They tend to form tumours. |
| 7. | Normal cells have a definite life span. | Cancer cells lack a definite lifespan and resist induction of cell death, thereby promoting tumour development. |
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