Which of the following is not a feature of malignant transformation by cultured cells?
**Core Concept**
Malignant transformation refers to the process by which normal cells acquire the characteristics of cancer cells, including uncontrolled growth, invasion, and metastasis. This process is often studied in the context of cultured cells, where researchers can manipulate variables to understand the underlying mechanisms.
**Why the Correct Answer is Right**
Malignant transformation by cultured cells is typically characterized by features such as anchorage-independent growth, loss of contact inhibition, and the ability to invade through a matrix. These features reflect the acquisition of a more aggressive and autonomous phenotype, which is a hallmark of cancer cells. The correct answer will not exhibit these features.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because anchorage-independent growth is a classic feature of malignant transformation.
**Option B:** Incorrect because loss of contact inhibition is a key characteristic of cancer cells.
**Option C:** Incorrect because the ability to invade through a matrix is a hallmark of malignant transformation.
**Clinical Pearl / High-Yield Fact**
It's essential to note that malignant transformation is a gradual process, and cells may exhibit intermediate characteristics before becoming fully malignant. This context is crucial for understanding the complexities of cancer biology.
**Correct Answer: A. Normal cells maintain anchorage dependence, meaning they require attachment to a surface to grow and proliferate.**