Which adult animal has red blood cells that contain a nucleus?

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Study for the AALAS Laboratory Animal Technician Test. Enhance your knowledge with comprehensive questions and detailed explanations. Prepare effectively for your LAT certification exam!

Multiple Choice

Which adult animal has red blood cells that contain a nucleus?

Explanation:
In adult mammals, red blood cells lose their nucleus during maturation to maximize space for hemoglobin, creating enucleated cells that are optimized for oxygen transport. Non-mammalian vertebrates, such as fish, keep their red blood cells with nuclei throughout life. So, among the options, the fish has nucleated red blood cells in adulthood. The other animals listed are mammals, whose mature red blood cells do not contain a nucleus.

In adult mammals, red blood cells lose their nucleus during maturation to maximize space for hemoglobin, creating enucleated cells that are optimized for oxygen transport. Non-mammalian vertebrates, such as fish, keep their red blood cells with nuclei throughout life. So, among the options, the fish has nucleated red blood cells in adulthood. The other animals listed are mammals, whose mature red blood cells do not contain a nucleus.

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