The following pertain to ribosomes during protein synthesis except Select one: a. they contain codons within their rRNA molecules. b. they participate only in translation. c. they bind to the 5' end of mRNA by their small subunit. d. they use their large subunit to supply enzymes for peptide bonding. e. they shift towards the 3' direction along the mRNA strand from one codon to the next.

Respuesta :

Given the non-coding nature of the rRNA present in ribosomes, we can conclude that option a is false.

Ribosomes are two-part structures in a cell that are in charge of the translation process, in which a strand of mRNA that codes for a certain protein is read and the protein is produced. Ribosomes are comprised of:

  • A large subunit
  • A small subunit
  • Various types of rRNA

Option b is correct given that translation is the very function of the ribosomes. To do this they bind the 5' end of the mRNA to the small subunit. Then move along the mRNA strand in small "steps" as they read the code in the 3' direction and use the enzymes present in the larger subunit to fuse together the corresponding amino acids. Therefore, options c, d, and e can also be confirmed as true.

The option which is false and therefore does not pertain to ribosomes during protein synthesis is option a which states that "they contain codons within their rRNA molecules". The rRNA present serves structural purposes among others in the ribosome but are non-coding. Given that any coding at this level is given by codons, we can conclude that they do not have codons.

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