Someone explain mRNA to me? and tRNA thanks

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yeah, as it says

this is from edexcel unit 1 AS level

thank you.

Posted Wed 1st May, 2013 @ 22:26 by amelia

1 Answer

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tRNA - transports amino acids to ribosomes for the assembly of polypeptides

  • Made in the nucleus and passes into the cytoplasm
  • Are folded lengths of RNA
  • At one end are three exposed bases where an amino acid can bind
  • At the other end are three unpaired nucleotide bases known as an anticodon
  • Each anticodon can bind temporarily to its complementary codon on the mRNA strand, during protein synthesis (translation)

mRNA - carries a copy of the DNA gene, which codes for the polypeptide being made during translation

  • Made during transcription
  • Single- stranded copy of the genetic code on the DNA
  • Shorter than DNA, so it can easily leave the nucleus
  • The sequence of codons (triplets of nucleotide bases) dictates the order of amino acids assembled in the polypeptide chain (protein)
Answered Thu 2nd May, 2013 @ 19:28 by Charlotte