Which of the following characteristics are found in a healthy cell ?
A. Metastasis
B. Presence of contact inhibition
C. Presence of proto - oncogenes
D. Uncontrolled cell division

Options

A. D+C
B. A+C
C. B+C
D. B+D

Answer

To solve the question about the characteristics found in a healthy cell, we will analyze each option provided:

1. **Option A: Metastasis**
- Metastasis refers to the spread of cancer cells from the original site to other parts of the body. This is a characteristic of cancerous cells, not healthy cells. Therefore, this option is incorrect.

2. **Option B: Presence of contact inhibition**
- Contact inhibition is a process where cells stop dividing when they come into contact with each other. This is a characteristic of healthy cells, as they regulate their growth and prevent overcrowding. Thus, this option is correct.

3. **Option C: Presence of proto-oncogenes**
- Proto-oncogenes are normal genes that can become oncogenes (cancer-causing genes) when mutated. While they are present in healthy cells, their presence alone does not define a healthy cell. Thus, this option is not definitive for healthy cells.

4. **Option D: Uncontrolled cell division**
- Uncontrolled cell division is a hallmark of cancer cells. Healthy cells have regulated growth and division processes. Therefore, this option is incorrect.

Now, let's summarize the findings:
- **Correct Characteristics of a Healthy Cell:**
- B. Presence of contact inhibition (correct)
- C. Presence of proto-oncogenes (not definitive for health)

Hence, the only characteristic that is definitively found in a healthy cell from the options given is **B. Presence of contact inhibition**.

**Final Answer: B. Presence of contact inhibition**