The structure present in a eukaryotic cell but absent in prokaryotic cells is:
Correct answer: A. Nucleus
- A. Nucleus
- B. DNA
- C. Ribosomes
- D. Cell surface membrane
Explanation
The correct answer is the nucleus. It is a hallmark of eukaryotic cells, encapsulating the cell's genetic material within a distinct, membrane-bound structure. Prokaryotic cells lack this feature; their genetic material is dispersed within the cell without a surrounding nuclear membrane. The other options are common to both cell types: DNA is present in all cells as the genetic blueprint, ribosomes are universal sites of protein synthesis, and the cell surface membrane is fundamental to maintaining cellular integrity and homeostasis.
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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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