1. The problem asks which property is found only in animal cells. 2. Let's analyze each option: - Presence of celluchaplasm: This is not a standard biological term; likely a typo or incorrect. - Response to signals outside of the cell: Both plant and animal cells can respond to external signals. - Regulated gene expression: This occurs in all eukaryotic cells, including plants and animals. - Analogphated cell membranes: This term is unclear or incorrect; possibly a typo. 3. The unique property of animal cells compared to plant cells is the presence of a flexible cell membrane without a rigid cell wall, allowing for diverse cell shapes and functions. 4. Therefore, the correct answer is related to the unique cell membrane structure of animal cells, which is not found in plant cells that have cell walls. Final answer: Animal cells uniquely have flexible cell membranes without cell walls, enabling specific responses and functions not found in plant cells.