Multiple Choice
In the context of cancer biology, which cells are considered 'immortal' due to their ability to divide indefinitely under appropriate conditions?
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11. Cell Division
Cancer
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Which best describes cancer cells?
A
They are unable to survive outside their tissue of origin.
B
They undergo programmed cell death more frequently than normal cells.
C
They only divide when growth factors are present.
D
They divide uncontrollably and can invade surrounding tissues.
Verified step by step guidance1
Understand the characteristics of normal cells: Normal cells divide in a controlled manner, respond to signals that regulate cell division, and undergo programmed cell death (apoptosis) when necessary to maintain tissue health.
Learn the key features of cancer cells: Cancer cells divide uncontrollably, bypassing the regulatory mechanisms that normally control cell division. They can also invade surrounding tissues and, in some cases, spread to other parts of the body (metastasis).
Evaluate the first option: 'They are unable to survive outside their tissue of origin.' This is incorrect because cancer cells can often survive and grow in other tissues, a process known as metastasis.
Evaluate the second option: 'They undergo programmed cell death more frequently than normal cells.' This is incorrect because cancer cells typically evade apoptosis, allowing them to survive and proliferate abnormally.
Evaluate the third option: 'They only divide when growth factors are present.' This is incorrect because cancer cells often bypass the need for external growth factors, enabling them to divide uncontrollably. The correct answer is: 'They divide uncontrollably and can invade surrounding tissues.'
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