An outer covering membrane is absent over which organelle?
Correct answer: A. Nucleolus
- A. Nucleolus
- B. Lysosome
- C. Mitochondrion
- D. Plastid
Explanation
Factual Recall. An outer covering membrane is absent over the nucleolus. The nucleolus is a dense, spherical, and colloidal body that remains attached to nucleolar organizing chromosomes. It was discovered by Fontana (1781) and termed 'nucleolus' by Bowman (1840). The main function of the nucleolus is the synthesis of ribosomal RNA and it is called the storehouse of RNA. It plays an important role in cell division also.
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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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