A eukaryotic cell that performs its functions and undergoes programmed cell death when no longer required is best described as a __________.
Normal cell
In a healthy body, normal eukaryotic cells carry out their assigned functions and, when they are damaged, worn out or no longer needed, they undergo a controlled process called programmed cell death (apoptosis). This keeps tissues in balance and prevents unwanted growth.
Malignant and tumour cells behave in the opposite way: they escape the signals for programmed death and keep on dividing, which is why they form tumours. Bacterial cells are prokaryotic, not eukaryotic, so they do not fit the description at all. The cell described in the question matches only a normal cell.
Hence, the answer is Normal cell.
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