Question 6

HeLa cells multiplied every 24 hours in culture and never stopped.

HeLa cells are deemed immortal due to their unique ability to proliferate continuously in culture, doubling every 24 hours without ceasing. This characteristic has allowed them to be a fundamental resource in medical research.

A) they didn't die even when exposed to toxins.

This option is incorrect because, while HeLa cells are robust, they can still be affected by toxins, which is a common trait of many cell types. The immortality of HeLa cells is not defined by their resistance to toxins but rather their continuous ability to divide.

B) they led to a cure for HIV and cancer.

While HeLa cells have played a significant role in research that contributed to advancements in treatments for diseases like HIV and cancer, they are not directly responsible for cures. This statement misrepresents the nature of their contribution, which is more about providing a platform for research rather than serving as a cure themselves.

C) they multiplied every 24 hours in culture and never stopped.

This statement accurately describes the defining feature of HeLa cells, which is their capacity to divide indefinitely in a laboratory setting. This continuous growth is what makes them "immortal" and a vital tool for scientific research.

D) they can cure diseases when injected into patients.

This option is incorrect as HeLa cells cannot cure diseases when injected into patients. They are not a treatment but rather a line of cells used for research and experimentation, emphasizing their role in understanding diseases rather than directly curing them.

Conclusion

The correct answer is clearly option C, as it highlights the fundamental characteristic of HeLa cells that defines their immortality—uninterrupted cellular division. Other options either misinterpret the nature of HeLa cells or inaccurately attribute capabilities that they do not possess. Understanding this core feature is essential for grasping the significance of HeLa cells in medical research.