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Biology · CELL THE UNIT OF LIFE

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What are the subunits and overall sedimentation coefficient of prokaryotic ribosomes, and what structure is formed when several such ribosomes attach to a single mRNA strand?

  1. 40S and 30S forming 70S; Chromatophore
  2. 60S and 40S forming 80S; Polysome
  3. 50S and 40S forming 70S; Inclusion body
  4. 50S and 30S forming 70S; Polyribosome (Polysome)

Correct answer · Option 4

50S and 30S forming 70S; Polyribosome (Polysome)

Explanation

Prokaryotic ribosomes are 70S, made of 50S and 30S subunits. Multiple ribosomes on a single mRNA form a polyribosome or polysome.

Related questions

In a diploid human somatic cell, approximately two metres of DNA is packaged within the nucleus into 46 chromosomes. What is the fundamental biochemical composition of interphase chromatin?→In plant cells, the tonoplast plays a crucial physiological role by facilitating the transport of a number of ions and other materials. What is the direction and nature of this transport relative to concentration gradients?→Given below are two statements:\n Statement I: The ribosomes of chloroplasts are 70S, which are smaller than the cytoplasmic 80S ribosomes of eukaryotic cells.\n Statement II: The inner membrane of the chloroplast is comparatively more permeable to solutes than its outer membrane. \nIn the light of the above statements, choose the most appropriate answer from the options given below:→Consider the following statements regarding the formulation of cell theory: (A) Matthias Schleiden concluded that the presence of cell wall is a unique character of plant cells. (B) Theodore Schwann studied different types of animal cells and observed a thin outer layer known as plasma membrane. (C) Schleiden and Schwann together formulated the cell theory but could not explain how new cells were formed. Which of the above statements are correct?→
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