In the genetic code,$61$ codons code for $20$ different types of amino acids. This is called:

Which of the following is a stop 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

Identify the correct match between the codons and coding functions.

Column-$I$	Column-$II$
$A. \; AUG$	$1. \; \text{Phenylalanine}$
$B. \; UAA$	$2. \; \text{Methionine}$
$C. \; UUU$	$3. \; \text{Tryptophan}$
$D. \; UGG$	$4. \; \text{Termination}$

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:

How many types of anticodons are present in a cell?