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  4. The two sub-units of ribosome remain united at a critical ion level of

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Q. The two sub-units of ribosome remain united at a critical ion level of

AIPMTAIPMT 2008Cell : The Unit of Life

Solution:

Ribosomes are very small organelles having a diameter of 150 A - 250 A. Each ribosome is made up of two subunits, a smaller subunit and another larger subunit. These two subunits are associated with the help of Mg2+ ions (at 0.001 M concentration). If the Mg2+ ions concentration is less in cytoplasm, the two units of ribosome separate but when the Mg2+ ions concentration is increased ten times, the two unites and form a dimer.