Which one of the following is true?

Who first discovered the genetic code?

The sequence of a processed $m-RNA$ is given as $5'-AUG\ CUA\ UAC\ CUC\ CUU\ UAU\ CUG\ UGA-3'$. How many amino acids will be present in the polypeptide chain translated from this $m-RNA$?

Statement $I$: The codon $\text{UAA}$ codes for lysine.
Statement $II$: Genetic code is usually ambiguous.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following pairs of codons is correctly matched with their function or the specific amino acid they signal?

The production of human proteins in bacteria through genetic engineering is possible because: