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- About 80 nucleotides in length and are made under the direction of genes in thechromosomes.
- Different tRNA molecule for each of the different possible anti-codons because of the degeneracy of the genetic code.
- Anti-codon at the base of each tRNA must make a perfect complementary match with the codon on the mRNA before the amino acid is released.
- Once released, the amino acid is added to the growing polypeptide chain by enzymes.
- Since there is different kinds of tRNA for each amino acids there must be at least 2kinds of tRNA.
- tRNA molecule is folded back on itself giving a complex 3-D shape.
- Each tRNA molecule must be able to combine with:
- One of the 20kinds of amino acid
- mRNA codon that specifies the amino acid
