Question:

Polyribosomes are aggregation of

Updated On: Jul 25, 2024
  • ribosomes and $ r RNA$
  • peroxisomes
  • several ribosomes held together by a string of $mRNA$
  • $rRNA$
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The Correct Option is C

Solution and Explanation

Ribosomes may occur singly as monosomes or in rosettes and helical groups called polyribosomes. The different ribosomes are connected with a $10 - 20?$ thick strand of $ mRNA$. They are formed during periods of active protein synthesis when a number of copies of the same polypeptide are required
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Concepts Used:

Translation

The translation is the process of converting nucleic acid information into amino acids. It also relates to the process of producing proteins from mRNA templates.

Components of Translation:

The main components of translation include :

  1. mRNA of both Eukaryotes and Prokaryotes
  2. tRNA - It helps in sending commands or transferring the information between protein and nucleic acids.
  3. Ribosomes - It contains ribosomal RNA and proteins, therefore, it is called the manufacturing unit of a cell.
  4. Enzymes - It is required for the formation of a peptide bond between the amino acids and also to attach amino acids to the accurate tRNA molecules.
  5. Proteins - They are the soluble factors, which are required for proper initiation, elongation and termination of translation.

Translation Process:

The three stages of translation are-

  • Initiation involves assembling ribosomes around mRNA and activating amino acid and delivering it to the transfer RNA.
  • Elongation is the process in which the RNA strand gets longer by adding amino acids. 
  • The termination process only involves releasing a polypeptide chain.