In eukaryotic organisms, which cell type normally contains no nucleus at maturity?

• A. Neuron
• B. Hepatocyte (liver cell)
• C. Mammalian red blood cell (erythrocyte)
• D. Skeletal muscle cell (myofiber)

Answer: (C)

Verified step by step guidance

1. Understand the question: It asks which eukaryotic cell type normally lacks a nucleus when mature.
2. Recall that most eukaryotic cells contain a nucleus, which houses the cell's genetic material and controls cellular activities.
3. Consider the options: neurons, hepatocytes, skeletal muscle cells, and mammalian red blood cells (erythrocytes).
4. Know that mammalian red blood cells lose their nucleus during maturation to maximize space for hemoglobin, enabling efficient oxygen transport.
5. Conclude that among the given options, the mammalian red blood cell is the cell type that normally contains no nucleus at maturity.