Out of $64$ codons,$61$ codons code for $20$ different amino acids. What is this property of the genetic code called?

Khorana and his colleagues synthesized an $RNA$ molecule with a repeating sequence of $U$ and $G$ nucleotides. The $RNA$ sequence "$UGU\ GUG\ UGU\ GUG$" produced a tetrapeptide with alternating chains of cysteine and valine. The codons for cysteine and valine are, respectively:

Streptomycin,kanamycin,and neomycin bind to the small subunits of prokaryotic ribosomes and cause:

Match the codons given in column $I$ with their respective amino acids given in column $II$ and choose the correct answer.

Column $I$ (Codons)	Column $II$ (Amino acids)
$(A)$ $UUU$	$(I)$ Serine
$(B)$ $GGG$	$(II)$ Methionine
$(C)$ $UCU$	$(III)$ Phenylalanine
$(D)$ $CCC$	$(IV)$ Glycine
$(E)$ $AUG$	$(V)$ Proline

Which one of the following statements is not correct?

Which of the following is not a property of the genetic code?