CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cancer cells refuse to commit apoptosis.
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Cancer cells induce angiogenesis.
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Cancer cells obey by not dividing when a strong and sustained signal is absent.
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Cancer cells can and do divide as many times as they want provided they get enough nutrients.
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Detailed explanation-1: -Cancer cells ignore signals from other cells Normal cells obey signals that tell them when they have reached their limit and will cause damage if they grow any further. But something in cancer cells stops the normal signalling system from working.
Detailed explanation-2: -Mutation in proto-oncogenes produces oncogenes that cause loss of control over cell cycle and uncontrolled and repetitive entry of cell in cell cycle thereby forming tumors. This makes option A incorrect.
Detailed explanation-3: -Unlike normal cells, cancer cells ignore signals to stop dividing, to specialize, or to die and be shed. Growing in an uncontrollable manner and unable to recognize its own natural boundary, the cancer cells may spread to areas of the body where they do not belong.
Detailed explanation-4: -Cancer cells behave differently than normal cells in the body. Many of these differences are related to cell division behavior. For example, cancer cells can multiply in culture (outside of the body in a dish) without any growth factors, or growth-stimulating protein signals, being added.