Who proposed the 'one gene one enzyme' hypothesis?

If an $RNA$ sequence has $999$ bases and codes for a protein with $333$ amino acids,and the base at position $901$ is deleted,resulting in a sequence of $998$ bases,how many codons will be altered?

If there are $6$ types of nitrogen bases and $40$ types of amino acids available for protein synthesis,what is the minimum number of nitrogen bases required to form a codon in the genetic code?

The genetic code necessary for building up its own amino acids during the multiplication of a virus is carried by:

Beadle and Tatum observed that each type of mutant bread mold showed the absence of a specific type of enzyme. Their experiments demonstrated that:.......

Which of the following statements is true regarding the genetic code?