The genetic code specifies:

$A$ sequence of how many nucleotides in messenger $RNA$ makes a codon for an amino acid?

Which of the following is a stop codon?

$A$ strand of deoxyribonucleotide contains information for a polypeptide consisting of $50$ amino acids. If a mutation occurs at the $25$th codon,changing $UAU$ to $UAA$,what will be the result?

Dr. Khorana prepared an artificial mRNA containing $CUCUCUCUCU$ nucleotides; its translation resulted in the formation of a polypeptide chain bearing alternately arranged . . . . . . and . . . . . . amino acids,respectively.

In the genetic code,there are $64$ codons.