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Eukaryotic organisms are characterized by cells that possess a true nucleus and membrane-bound organelles. This category includes a diverse range of life forms, specifically both animal and plant cells, which share distinct structural features such as a nucleus that contains genetic material, mitochondria for energy production, and in the case of plant cells, chloroplasts for photosynthesis.
Animal cells do not have a rigid cell wall, allowing for flexibility and the formation of various tissues and organs, while plant cells possess a cell wall that provides structural support. Both types of cells are complex and play crucial roles in the biology of multicellular organisms, making this answer relevant to the definition of eukaryotic cells.
In contrast, bacterial cells are prokaryotic, lacking a nucleus and organized internal structures, which is a key distinction. The other options suggest limitations on the types of eukaryotic cells, which does not accurately represent the diversity found within this group. Therefore, recognizing that both animal and plant cells fall under the eukaryotic category is essential for understanding the broader spectrum of life forms in biology.