Question

What typically happens if the cells of a cell line are injected into susceptible lab animals?

A) They become a normal part of the appropriate tissue in the lab animal.
B) They soon die.
C) They typically grow into malignant tumors.
D) They typically grow into the appropriate organ.
E) They become part of organs

Answer 1

Typically, when cells from a cell line are injected into lab animals, they grow into malignant tumors (option C) due to their ability to proliferate uncontrollably and induce cancerous growths.

Step-by-step explanation:

When the cells of a cell line are injected into susceptible lab animals, they typically grow into malignant tumors. A cell line is comprised of cells that have undergone transformation to become effectively immortal and are capable of indefinite growth. These cells have escaped the normal regulation of cell growth, and when introduced into a lab animal, they often continue their uncontrolled proliferation. This can lead to the formation of tumors that are cancerous and capable of damaging surrounding tissues.

Moreover, the injected cell line may exhibit features like loss of contact inhibition, chromosomal abnormalities, and resistance to apoptosis, factors that contribute to the aggressive, invasive nature of cancer. Additionally, cancerous cells can suppress the immune response making them difficult for the body to detect and attack, leading to further spread and potentially to metastasis, where new tumors form in other parts of the body.