Multiple choice

What concentration of magnesium ions is required for joining of ribosomes to form dimers?

  1. Mg++ ion concentration is 0.001 M

  2. Mg++ ion concentration is 0.01 M

  3. Mg++ ion concentration is less than 0.0001 M

  4. Mg++ ion concentration is more than 0.02 M
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 At this concentration, the ribosomes combine in pairs, to form dimers, each of which has a sedimentation coefficient of 120 S.(�S� is the sedimentation coefficient & is also known as �Svedberg Unit� ).

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