Which is the initiator codon?

Match the columns.

Column-$I$	Column-$II$
$(a)$ $UUU$	$(1)$ Serine
$(b)$ $GGG$	$(2)$ Methionine
$(c)$ $UCU$	$(3)$ Phenylalanine
$(d)$ $CCC$	$(4)$ Glycine
$(e)$ $AUG$	$(5)$ Proline

The genetic code of proline are:

Codon on $mRNA$ and anticodon on $tRNA$ are

The arrangement of $DNA$ has the triplet base sequence $AAC\ GAC\ AGC\ GGC\ ACA\ AAA$. Due to a mutation,the first base is deleted. What is the likely effect of this on the coding of the $DNA$ segment?

How many amino acids are encoded by only a single codon?