The $m-RNA$ contains ........... codons.

How many codons are possible in a cell?

How many genetic codes specify the amino acid proline?

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

According to the genetic code,some amino acids are encoded by more than one codon. This characteristic of the genetic code is . . . . . . .

The assumption that the genetic code is a triplet was suggested by: