Multiple Choice
Which of the following cell types has the longest cell renewal factor (CRF), indicating the slowest rate of cell turnover?
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11. Cell Division
Cell Cycle Regulation
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Why does a skin cell need to divide more frequently than a liver cell?
A
Liver cells have a higher metabolic rate, so they divide more slowly.
B
Skin cells are exposed to more environmental damage and need to be replaced more often.
C
Skin cells contain more DNA, requiring more frequent division.
D
Liver cells are unable to undergo mitosis after development.
Verified step by step guidance1
Understand the context: Skin cells and liver cells have different roles in the body. Skin cells form the outer protective layer and are exposed to environmental factors like UV radiation, physical abrasion, and pathogens, while liver cells are internal and primarily involved in metabolic processes.
Recognize the need for replacement: Skin cells are frequently damaged or shed due to their exposure to external factors. To maintain the integrity of the skin barrier, these cells must be replaced more often through cell division.
Compare with liver cells: Liver cells are not exposed to the same level of environmental damage as skin cells. They have a longer lifespan and do not need to divide as frequently to maintain liver function.
Clarify the misconception: The division rate of cells is not determined by the amount of DNA they contain. Both skin and liver cells have the same amount of DNA, as they are somatic cells with a diploid chromosome number.
Address the incorrect statement: Liver cells are capable of undergoing mitosis when necessary, such as during liver regeneration after injury. However, under normal conditions, they divide less frequently compared to skin cells.
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