CELL DIVISION
CELL DIVISION AND CANCEROUS CELLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cancer cells divide uncontrollably
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Normal cells divide uncontrollably
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Cancer cells cannot make copies of DNA
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Normal cells cannot make copies of DNA
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Detailed explanation-1: -Unlike normal genes, oncogenes cannot be turned off, so they cause uncontrolled cell growth. In normal cells, tumor suppressor genes prevent cancer by slowing or stopping cell growth. DNA changes that inactivate tumor suppressor genes can lead to uncontrolled cell growth and cancer.
Detailed explanation-2: -Unlike healthy cells, cancer cells don’t carry on maturing or become so specialised. Cells mature so that they are able to carry out their function in the body. This process of maturing is called differentiation. In cancer, the cells often reproduce very quickly and don’t have a chance to mature.
Detailed explanation-3: -Cells that progress through the cell cycle unchecked may eventually form malignant tumors, where masses of cells grow and divide uncontrollably, then develop the ability to spread and migrate throughout the body.
Detailed explanation-4: -2) Please notice that cancer cells do not grow or divide faster than normal cells, although many people believe that, and most forms of chemotherapy were designed on the assumption that they grow faster.