Rna interference may be triggered when inverted repeats in an rna molecule fold to form double‑stranded rna.
5'-.....CGAUU..........AAUCG.....-3'rna sequences can potentially fold to form double‑stranded rna via a hairpin loop.Three nucleotide bases on mRNA (which are complementary to three nucleotide bases on DNA) are called codon. Each codon codes for the specific amino acid.
There are 20 different amino acids, but there are more than 20 combinations of three nucleotide bases on DNA. There are 64 different combinations of three nucleotide bases on DNA, which is about 3 times more than the number of amino acids. So, different combinations of three nucleotide bases code for one amino acid
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