Network of tubules continuous with nuclear membrane:
Correct answer: C. ER
- A. RER
- B. SER
- C. ER
- D. None
Explanation
The correct answer is ER because the Endoplasmic Reticulum (ER) is a network of membrane-enclosed tubules and sacs (cisternae) that extends from the nuclear membrane throughout the cytoplasm. It plays a critical role in the synthesis and transport of proteins and lipids. The RER and SER are parts of the ER, with RER being involved in protein synthesis due to the presence of ribosomes, and SER being involved in lipid synthesis and detoxification. The option 'None' is incorrect as the ER is indeed the structure described in the question.
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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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