Which of the following statements are not true?

Options

A. In animals cells during S phase DNA replication being in nucleus and centroide duplication in cytoplasm
B. During G1 protein are synthesized and cell continues to grow synthesized and cell continues to grow
C. All cells in adult animals appear to exhibit cell division
D. All are true

Answer

To determine which of the statements provided in the question are not true, we will analyze each statement one by one based on our understanding of the cell cycle.

### Step-by-Step Solution:

1. **Statement A: In animal cell during S phase DNA replication begins in nucleus and centriole duplication in cytoplasm.**
- **Analysis:** This statement is true. During the S phase of the cell cycle, DNA replication occurs in the nucleus, and centriole duplication occurs in the cytoplasm.

2. **Statement B: During G1 phase proteins are synthesized and cell continues to grow.**
- **Analysis:** This statement is also true. The G1 phase is characterized by cell growth and the synthesis of proteins necessary for DNA replication and cell division.

3. **Statement C: All cells in adult animals appear to exhibit cell division.**
- **Analysis:** This statement is not true. Not all cells in adult animals undergo division. For example, mature nerve cells and heart cells do not typically divide.

4. **Statement D: All are true.**
- **Analysis:** This statement is false because we have identified that Statement C is not true. Therefore, not all statements can be considered true.

### Conclusion:
The statement that is not true is **C: All cells in adult animals appear to exhibit cell division.**

### Final Answer:
C. All cells in adult animals appear to exhibit cell division.

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