CBSE Class 12-science Answered
Expert Answer
An abnormal and uncontrolled division of cells is termed as cancer.
|
Cancer Cell |
Normal Cell |
|
(i) Cancer cells divide in an uncontrolled manner. |
(i) Normal cells divide in a controlled manner. |
|
(ii) The cells do not show contact inhibition. |
(ii) These cells show contact inhibition. |
|
(iii) Lifespan is indefinite. |
(iii) There is a definite lifespan. |
The growth and differentiation of cells is highly controlled and regulated. The normal cells show a property called contact inhibition. The surrounding cell inhibits uncontrolled growth and division of cells. The normal cells lose this property and become cancerous cell giving rise to masses of cells called tumors. Transformation of normal cells into cancerous cells is induced by physical, chemical and biological agents that are called carcinogens.
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