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STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 8. Cell the unit of life1 Mark
MCQ
Select the incorrect statement about prokaryotic ribosomes.
  • ✓
    $50\; S$ and $30\; S$ subunits unite to form $80\; S$ ribosomes.
  • B
    $50\; S$ and $30\; S$ subunits unite to form $70\; s$ ribosomes.
  • C
    Ribosome is the site of protein synthesis.
  • D
    Polysome indicate the synthesis of identical poolypeptide in multiple copies.
✓

Answer

Correct option: A.
$50\; S$ and $30\; S$ subunits unite to form $80\; S$ ribosomes.
a
Prokaryotes have $70\; S$ ribosomes, each consisting of a small ($30\; S$) and a large ( $50\; S$) subunit. Polyribosomes (or polysomes) are a cluster of ribosomes, bound to a $RNA$ molecule in translation during the process of protein synthesis. It was first discovered and characterized by Jonathan Warner, Paul Knopf, and Alex Rich in $1963$. Polysomes indicate the synthesis of identical polvpeptide in multiple copies.

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