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Ribosomes is an organelle observed in a ...

Ribosomes is an organelle observed in a eukaryotic cell involved in protein synthesis . Ribosomes of a eukaryotic is 80S type . It is associated with which of these ?
I. Plasmid
II. Mitochondrion
III. Nucleus
IV. Golgi Body
V.Endoplasmic Reticulum

A

I, II, III and IV

B

I, II and III only

C

I and II only

D

III and V only

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the association of 80S ribosomes in eukaryotic cells, we will analyze each option provided: 1. **Understanding Ribosomes**: - Ribosomes are non-membrane bound organelles involved in protein synthesis. In eukaryotic cells, ribosomes are classified as 80S, which consists of two subunits: 60S and 40S. 2. **Analyzing the Options**: - **I. Plasmid**: Plasmids are small, circular DNA molecules found in prokaryotic cells, not eukaryotic cells. Therefore, ribosomes are not associated with plasmids. - **II. Mitochondrion**: Mitochondria contain 70S ribosomes, which are distinct from the 80S ribosomes found in the cytoplasm and on the rough endoplasmic reticulum. Thus, 80S ribosomes are not associated with mitochondria. - **III. Nucleus**: Ribosomes are synthesized in the nucleolus, a part of the nucleus, and can be found in the nucleus. Therefore, 80S ribosomes are associated with the nucleus. - **IV. Golgi Body**: The Golgi apparatus is involved in modifying and packaging proteins but does not contain ribosomes. Therefore, 80S ribosomes are not associated with the Golgi body. - **V. Endoplasmic Reticulum**: The rough endoplasmic reticulum (RER) is studded with ribosomes on its cytoplasmic surface, where protein synthesis occurs. Thus, 80S ribosomes are associated with the endoplasmic reticulum. 3. **Conclusion**: - From the analysis, we find that the 80S ribosomes are associated with: - III. Nucleus - V. Endoplasmic Reticulum Therefore, the correct answer to the question is **III and V**.
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