Two morphological forms of endoplasmic reticulum are:
Correct answer: A. ER with ribosome and ER without ribosome
- A. ER with ribosome and ER without ribosome
- B. ER with cisternae and ER without cisternae
- C. ER with enzymes and ER without enzymes
- D. Rough endoplasmic reticulum and sarcoplasmic reticulum
Explanation
The endoplasmic reticulum (ER) can be categorized into two primary forms based on the presence of ribosomes. The rough endoplasmic reticulum (RER) has ribosomes attached to its surface, giving it a 'rough' appearance. This form is involved in protein synthesis. The smooth endoplasmic reticulum (SER), on the other hand, lacks ribosomes and is involved in lipid synthesis and detoxification processes. Option A correctly identifies these two forms. Other options are incorrect due to misunderstandings of ER structure and function: Option B inaccurately states the absence of cisternae, Option C incorrectly uses enzyme presence as a distinguishing factor, and Option D confuses a specific type of SER with a general category.
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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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