Question

A phenomenon where the third base of mrna at its 5'end can pair with a non complementary base of mrna is called

Answer 1

The answer to this can be WOBBLE EFFECT/ PHENOMENON.

At the third codon position, the set of base-pairing rules are relaxed and less stringent (reading from 5' to 3' direction). This allows a small number of tRNAs molecules to cover all the codons of the genetic code. Nonetheless, the codon is read accurately.

For example: A 'G' in the anitcodon can pair with C or U; which are present at the third position in the codon. You can also follow the diagram;