Which one of the following eukaryotic cell structures does not contain DNA?
Correct answer: C. Endoplasmic reticulum
- A. Nucleus
- B. Mitochondrion
- C. Endoplasmic reticulum
- D. Chloroplast
Explanation
The endoplasmic reticulum is a network of membrane-bound tubules. It does not contain DNA. The nucleus is the brain of the cell. It contains all the genetic information of the cell in the form of DNA. Mitochondria and chloroplasts are thought to have a symbiotic origin with bacteria. Detailed studies of mitochondria chloroplasts under an electron microscope show that a small circular DNA molecule is present in the mitochondrial matrix and stroma of chloroplast.
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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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