How many types of $tRNA$ are there?

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

The "one gene one enzyme" theory was proposed by:

How many types of $t-RNA$ are present in the cytoplasm?

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.

If the sequence of nucleotides on $m-RNA$ is $AUG, UUU, CUU, AAC, GCA, CAC$,what will be the sequence of amino acids encoded by these codons?