Prophase is preceded by a preprophase stage in what type of cells?

• Correct Answer: plant cells
• egg cells
• brain cells
• hair and nail cells

Explanation: As plant cells have some structural differences compared to an animal cell, an additional stage prior to prophase is necessary. In plant cells only, prophase is preceded by a preprophase stage. Plant cells have a large central vacuole encompassing the center of the cell. Prior to the division of the nucleus, the nucleus must migrate to the center of the plant cell. To accomplish this, the cell forms a phragmosome , a sheet of cytoplasm that bisects the middle of the cell. The phragmosome suspends the cell nucleus in the center of the cell in preparation for prophase. Additionally, during this phase the plane of cell division is established. The accurate control of division planes, which establishes the placement of the future cell wall, is crucial for the correct structure of plant tissues and organs.

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