Q:
      
      
         
            
In human body, the cell growth and differentiation are highly controlled and regulated, but in cancer cells
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: A) there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors         
         
Explanation: In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant.
 
       
      
      
      
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