It is not found in composition of ER:
Correct answer: D. DNA
- A. Carbohydrates
- B. Lipids
- C. Proteins
- D. DNA
Explanation
The endoplasmic reticulum (ER) is primarily composed of lipids and proteins, which help in its structural formation and function in synthesis and processing roles. Carbohydrates may be present in conjunction with proteins, forming glycoproteins, but they are not a fundamental structural component of ER. DNA is not present in the ER; it is located within the nucleus and mitochondria, which are responsible for genetic storage and expression. Thus, DNA is the correct answer as it is not a component of the ER.
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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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