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What produces a signal for a cell to grow and divide?

  1. Proteins

  2. DNA

  3. Mitochondria

  4. Membranes

The correct answer is: DNA

DNA is responsible for providing genetic instructions in cells, including the signal to grow and divide. While proteins, mitochondria, and membranes play important roles in a cell, they do not produce the specific signal for growth and division. Proteins and mitochondria have multiple functions within a cell, while membranes primarily serve as a barrier for the cell. However, DNA contains specific genes that code for cell growth and division, making it the correct answer.