An enucleated animal cell is
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An enucleated animal cell is a cell that lacks a nucleus. The nucleus is the control center of the cell, containing its genetic material (DNA). Without a nucleus, the cell cannot perform functions like cell division or protein synthesis based on its own DNA instructions.
Step 1: Understand what "enucleated" means. "Enucleated" literally means "without a nucleus" (from the prefix "e-" meaning "out of" and "nucleus").
Step 2: Review the options and identify which cell type naturally loses its nucleus as part of its maturation process to perform its specialized function.
- Platelet: These are fragments of cells (megakaryocytes) and are not complete cells themselves.
- Epidermal cell: These are skin cells that have a nucleus.
- RBC: This stands for Red Blood Cell (or erythrocyte). In mammals, these cells eject their nucleus to make more space for hemoglobin, the protein that carries oxygen.
- Neuron: These are nerve cells that have a very prominent nucleus.
Step 3: Compare the functions. A Red Blood Cell's primary job is to transport oxygen. By losing its nucleus, it becomes a biconcave disc, maximizing its surface area for gas exchange and its capacity to carry hemoglobin.
Final Answer: The enucleated animal cell is the RBC (Red Blood Cell).
Related Topic: Specialized Animal Cells
Animal cells can become specialized for specific tasks, a process called differentiation. This often involves changes to their structure. The loss of the nucleus in mammalian RBCs is an extreme example of this specialization, allowing them to be highly efficient at their single task of oxygen transport. Other cells, like neutrophils (a type of white blood cell), have lobed nuclei, and muscle cells are multinucleated.
Key Formulae & Theory
While there is no specific formula for an enucleated cell, the concept is rooted in cell biology. The volume of a sphere (a simple model for a cell) is given by:
By removing the large, rigid nucleus, the cell can change its shape, increasing its surface area-to-volume ratio, which is crucial for diffusion. The surface area of a sphere is:
A higher surface area to volume ratio facilitates more efficient gas exchange.