Which of the following cells do not possess a nucleus?
Correct answer: D. All of the above
- A. Sieve tube cells
- B. Bacteria
- C. Red blood cells
- D. All of the above
Explanation
The correct answer is 'All of the above'. Sieve tube cells, bacteria, and red blood cells all lack a nucleus. Sieve tube cells, part of the plant's phloem, lose their nucleus to allow efficient nutrient transport. Bacteria, as prokaryotes, naturally lack a defined nucleus and instead have their genetic material dispersed in the cytoplasm. Red blood cells in mammals extrude their nucleus during development to create more space for hemoglobin, thereby enhancing their oxygen-carrying capacity. Each of these cell types has adapted to function without a nucleus for efficiency in its specific role.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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