Final answer:
Mammary gland epithelial cells removed from their natural environment and grown on a culture dish typically lose their ability to produce milk proteins (option b) and appear as flattened, undifferentiated cells (option c).
Step-by-step explanation:
When mammary gland epithelial cells are removed from a mammary gland and grown on a bare culture dish, they typically lose their ability to synthesize milk proteins. These cells are specialized and highly differentiated in the body to produce milk under the influence of specific hormonal signals within the mammary gland's intact structure.
As a result of being removed from their natural context and grown in vitro, without the three-dimensional structure and signaling context of the mammary gland tissue, these cells tend to appear as flattened, undifferentiated cells. They often cannot perform their specialized function of milk production when grown outside their usual environment.