CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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they control the cell cycle
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they are internal to the cell
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they are external to the cell
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they cause cancer
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Detailed explanation-1: -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-2: -Similarly, positive regulators of cell division can lead to cancer if they are too active. In most cases, these changes in activity are due to mutations in the genes that encode cell cycle regulator proteins.
Detailed explanation-3: -Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
Detailed explanation-4: -Hence, the property which cancer cells does not have is they show contact inhibition.