The attachment of two subunits of ribosome along mRNA is controlled?
Correct answer: D. Magnesium ions
- A. Sodium ions
- B. Calcium ions
- C. Potassium ions
- D. Magnesium ions
Explanation
The correct answer is Option D: Magnesium ions. Magnesium ions play a crucial role in stabilizing the ribosome-mRNA complex by neutralizing the negative charges of the RNA backbone and facilitating hydrogen bond formation between mRNA and rRNA bases. The other options, sodium, calcium, and potassium ions, do not have a significant role in controlling the attachment of ribosome subunits along mRNA.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Cytoplasmic Organelles
Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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