Cells have many small mitochondria instead of one large one to increase surface area. More surface area allows faster energy production, efficient reactions and better distribution of energy throughout the cell.
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If skin cells divide by meiosis, they would produce cells with half the chromosome number. This would disrupt normal repair and the cut would not heal properly.
Yes, onion root tip cells are visible under a microscope. They are not similar in structure because they are at different stages of cell division, showing structural differences.
The first stage of cell division is interphase, where the cell prepares for division by growing and duplicating its DNA before entering the active stages of division.
Normal cells grow and divide through cell division. They increase in number, repair tissues and replace dead cells. This process is controlled and essential for growth and maintenance.