Which of the following explains why normal cells grown in a petri dish tend to stop growing?
Correct answer: C. Contact with other cells stops cell growth
- A. The cells lack cyclin
- B. The petri dish inhibits cell growth
- C. Contact with other cells stops cell growth
- D. Most cells grown in petri dishes have a defective p53
Explanation
If a cell lacks cyclin or has insufficient levels of cyclin, it may experience delays or abnormalities in cell cycle progression, leading to impaired growth. Without the proper activation of CDKs by cyclins, key processes like DNA replication and chromosome segregation may not occur efficiently, resulting in cell cycle arrest or defects in cell division. These disruptions can ultimately affect the overall growth and proliferation of the cell.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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