Which type of cells is described as poorly differentiated?

Poorly differentiated cells are characterized by their lack of resemblance to normal cells. This means that they often have an irregular structure and morphology, which indicates that they have lost some of their specialized functions and features typically found in normal, healthy cells. In cancer, the degree of differentiation can indicate how aggressively the tumor may behave; poorly differentiated tumors tend to grow and spread more aggressively than well-differentiated tumors.

Cells that closely resemble normal cells are typically well-differentiated and tend to behave in a more controlled manner, suggesting a lower risk for aggressive disease. Encapsulated and homogenous cells, as well as well-demarcated cells, imply a level of organization and structural integrity that is absent in poorly differentiated cells. Therefore, the correct choice reflects the distinct characteristics of poorly differentiated cells in the context of cancer biology.