Which of the following components of an animal cell is not observed in a bacterial cell?
Correct answer: A. Nucleus
- A. Nucleus
- B. Ribosomes
- C. Cell membrane
- D. DNA
Explanation
The correct answer is the nucleus. Animal cells, as eukaryotes, have a well-defined nucleus enclosed by a nuclear membrane, which houses the cell's genetic material. In contrast, bacterial cells, being prokaryotic, do not have a true nucleus. Their genetic material is located in the nucleoid, a region within the cytoplasm without a surrounding membrane. Ribosomes, the cell membrane, and DNA are all present in both animal and bacterial cells, though they may differ in size and organization.
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About Cell Structure and Function
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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