The cell-free system was helpful in which of the following?

$A$ 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?

There are $64$ codons in the genetic code because....

$A$ naturally occurring coding strand composed of alternating $C$ and $U$ residues would result in the formation of

In the genetic code dictionary,how many codons are used to code for the $20$ amino acids?

Which of the following $m-RNA$ sequences can be completely translated into a polypeptide chain?
$(a)\ 5'-AUG\ UGA\ UUA\ AAG\ AAA-3'$
$(b)\ 5'-AUG\ AUA\ UUG\ CCC\ UGA-3'$
$(c)\ 5'-AGU\ UCC\ AGA\ CUC\ UAA-3'$
$(d)\ 5'-AUG\ UAC\ AGU\ AAC\ UAG-3'$